We wonder ___________ quite a number of ...

We wonder ___________ quite a number of living things are dying out.

A．that

B．as

C．why

D．when

C 【解析】试题分析：考查宾语从句。句意：我想知道为什么有如此多的生物灭绝。That在宾语从句中不能充当任何成分，之前连接作用；as不能引导宾语从句。When的意思不搭配。故C正确。考点：考查宾语从句

考点分析：

相关试题推荐

He was so busy that he couldn’t help ____________ the experiment.

A．doing

B．do

C．did

D．done

查看答案

After he ________ the golf club, he has ________ a number of competitions.

A．took part in; taken part in	B．joined; taken part in
C．joined in; joined in	D．joined; joined

查看答案

My uncle’s house is much smaller than ours, but it is twice expensive.

A．as

B．so

C．too

D．very

查看答案

He seems to Jane. He knows her well.

A．introduce to

B．be introducing to

C．be introduced to

D．have been introduced to

查看答案

One of the most important questions they had to consider was of public health.

A．what

B．this

C．that

D．which

查看答案

试题属性