题目内容
13.Our neighbor offered to look after our baby yesterday when we were busy,_____isoften the case.( )
A. | it | B. | that | C. | which | D. | as |
分析 昨天当我们忙的时候,我的邻居主动提出照顾我们的孩子,就像他们平时做的一样.
解答 答案:D.根据句式可知_____is often the case.是定语从句,先行词是整个主句,有这种用法的只有as和which,但是as 代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词;若为行为动词,则从句中的关系代词只能用which,所以答案是D.
点评 考查非限制性定语从句.
1.as 可以在定语从句中做主语或宾语,代表前面整个句子.如:
He married her,as was natural.他跟她结婚了,这是很自然的事.
2.as 引导的非限制性定语从句可以放在主句之前、主句之后,甚至还可以分割主句. 另外,as 常常有"正如、正像"的含义.如:
As is known to all,China is a developing country.众所周知,中国是发展中国家.
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