OG16 SC 39题考点求助

qinwenxi · 发表于 2015-11-19 22:29:09

Around 1900, fishermen in the Chesapeake Bay area landed more than seventeen million pounds of shad in a single year, but by 1920, over-fishing and the proliferation of milldams and culverts that have blocked shad migrations up their spawning streams had reduced landings to less than four million pounds.

(A) that have blocked shad migrations up their spawning streams had reduced landings to less
(B) that blocked shad from migrating up their spawning streams had reduced landings to less
(C) that blocked shad from migrating up their spawning streams reduced landings to a lower amount
(D) having blocked shad from migrating up their spawning streams reduced landings to less
(E) having blocked shad migrations up their spawning streams had reduced landings to an amount lower

A The present-perfect tense of have blocked inappropriately describes an
event that caused something to happen before 1920. In addition, migrations
up their spawning streams is incorrect.
B Correct. The comparison of poundage is efficiently explained, and the
sequence of tenses makes sense. Despite a possible superficial appearance
of a comparison between countable things (pounds), less is more
appropriate than fewer for the comparison. The fishermen landed different
amounts of fish; they did not land the numbers of pounds in terms of which
those amounts are measured.
C The comparative expression to a lower amount is unnecessarily wordy.
The past-perfect form had reduced would make the temporal relationships
somewhat clearer than does the past tense reduced.
D The present-perfect participial phrase, having blocked . . . streams, should
be set off in commas; as it stands, it does not make sense. The past-perfect
form had reduced would make the temporal relationships somewhat clearer
than does the past tense reduced.
E The present-perfect participial phrase must be set off with commas; the
pronoun their, which is also in (A), nonsensically refers to migrations, and
the comparative expression to an amount lower is unnecessarily wordy.

这道题选出正确答案不难，但是对于OG在解释D和E中说“ The present-perfect participial phrase, having blocked . . . streams, should
be set off in commas”“The present-perfect participial phrase must be set off with commas”表示不解，不set off有什么关系吗？不是都是修饰吗？

本贴相关题目 OG-2017V-SC-226OG-2017V-SC-226
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OG16 SC 39题 考点求助

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本贴相关题目 OG-2017V-SC-226OG-2017V-SC-226
OG-2016V-SC-38
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OG16 SC 39题考点求助