GWD20-Q21Gas hydrates, chemical compounds of water and natural gas, are increasingly being studied for their potential to be huge reservoirs of energy, possibly causing sea floor instability, and significant contributors to global warming.(E)to be huge reservoirs of energy, possibly causing sea floor instability, and
to be huge reservoirs of energy, possibly causing sea floor instability, and even as
!as huge reservoirs of energy, possibly causing sea floor instability, and
as huge reservoirs of energy, and the possible cause of sea floor instability,第三个并列要and
as huge reservoirs of energy, as possible causes of sea floor instability, and even as
对这道题的并列不是很理解，E里面的并列干嘛不用as n.,n.,and n..而是都用as连接呢。我选择的C.
GWD20-Q29Researchers agreed that the study of new treatments for heart attack patients was extremely important but more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than the balloon procedure by itself.(C)more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than
more research was needed for determining whether or not balloon angioplasty preceded by ultrasound is any better for heart attack patients than is
that more research was needed to determine whether balloon angioplasty preceded by ultrasound is any better for heart attack patients than
that more research was needed to determine that balloon angioplasty preceded with ultrasound was any better for heart attack patients than
that more research was needed for determining that balloon angioplasty preceded by ultrasound is or is not any better for heart attack patients than is
C的后半句为什么用的是一般现在时呢，我选的D，错在哪里？谢谢大侠。-- by 会员 花花臭臭 (2012/10/24 18:40:18)
1. Gas has three potential for studying , such three parts should be put in parallel form
C is not parallel
also in E , you can have such structure( although a little wordier)
notice that you can have to do, to do and to do or to do, do and do (same case here for as)
2.
notice the existence of whether
the question is not yet being answer
if you used simple past
you are illogically suggested that an unanswered question has already been answered ( that is self- contradictory)
preceded with is not idiomatic ； it should be preceded by
also， D is much wordier than C （though not a fatal issue） | 
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发表于 2012-10-24 18:40:18
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