04-05-15， 04-10-15

vifverter

04-05-15

15.Nylon was ___the human-made fibers.

A.      the first of which

B.      what the first of

C.      it the first of

D.     the first of

why the answer is D instead of B?

04-10-15

15. A challenging new area in inorganic chemistry is ____ the role of transition metals in the biochemical catalysts called enzymes.

A. that of understanding

B. to have understanding

C. the understanding

D. understanding that

Why the answer is A although I chose it? who can explain the structure of this sentence?

numberX

以下是引用vifverter在2005-1-13 19:37:00的发言：

04-05-15

15.Nylon was ___the human-made fibers.

A.      the first of which

B.      what the first of

C.      it the first of

D.     the first of

why the answer is D instead of B?

选B的话从句没有谓语

04-10-15

15. A challenging new area in inorganic chemistry is ____ the role of transition metals in the biochemical catalysts called enzymes.

A. that of understanding

B. to have understanding

C. the understanding

D. understanding that

Why the answer is A although I chose it? who can explain the structure of this sentence?

句子缺宾语

barmecide

Why not C? What about if we have another choice E. understianding?

Thanks

brace

以下是引用barmecide在2005-1-14 0:04:00的发言：

Why not C? What about if we have another choice E. understianding?

Thanks

if choose c, it must be

the understanding of