以下是引用weiyu在2004-6-21 13:56:00的发言：D contains an abiguity; You may refer to an OG question I have to note that choice B contains the ambiguous modification. after doing..., doing.., star... (the second present participle is questionable modification part) 35. A star will compress itself into a white dwarf, a neutron star, or a black hole after it passes through a red giant stage, depending on mass. (A) A star will compress itself into a white dwarf, a neutron star, or a black hole after it passes through a red giant stage, depending on mass. (B) After passing through a red giant stage, depending on its mass, a star will compress itself into a white dwarf, a neutron star, or a black hole. (C) After passing through a red giant stage, a star’s mass will determine if it compresses itself into a white dwarf, a neutron star, or a black hole. (D) Mass determines whether a star, after passing through the red giant stage, will compress itself into a white dwarf, a neutron star, or a black hole.（D） (E) The mass of a star, after passing through the red giant stage, will determine whether it compresses itself into a white dwarf, a neutron star, or a black hole. Choice A is ambiguous because the grammatical function of depending on mass is uncertain: the phrase could modify either the whole preceding statement or only the words after it passes through a red giant stage. In the latter case, choice A states in effect that a star depends on its mass as it passes through this phase, not the fate of the star depends on the star’s mass. Choice B suffers from the same ambiguity. Choices C and E illogically maintain that the star’s mass, not star itself, passes through the red giant stage to assume another form. Choice D is the correct answer for this difficult question agree！ D. Minivans, carrying as many as seven passengers, compared with most sport utility vehicles, cost less … compared with most sport utility vehicles可能会修饰carrying as many as seven passengers，illogically means that “Compared with most sport utility vehicles, Minivans carry as many as seven passengers.”（参考大全31, 补充-035的B选项） A对，两个and的层次不同。参考og11紫皮SC-1
1. Some bat caves，like honeybee hives，have residents that take on different duties such as defending the entrance，acting as sentinels and to sound a warning at the approach of danger, and scouting outside the cave for new food and roosting sites． (A) acting as sentinels and to sound (B) acting as sentinels and sounding (C) to act as sentinels and sound (D) to act as sentinels and to sound (E) to act as a sentinel sounding Parallelism + Agreement The original sentence has an error in parallel structure．It starts by using the-ing (participial) form to list the bats’ duties．Defending，acting，and scouting all use the same-ing form．The phrase to sound uses the to-(infinitive)form，and so it is not parallel．The word sounding is required in this sentence A To sound is not parallel to defending, acting，and scouting． B Correct．This sentence has sounding, which properly parallels defending, acting, and scouting． C To act and sound are not parallel to defending and scouting． D To act and to sound are not parallel to defending and scouting． E Introduces agreement error(a sentinel)；to act is not parallel to scouting． The correct answer is B． 请指教！
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