题目内容

20．I have had such a case ______ a boy whispered to his deskmate now and then while I was having lessons．（　　）
A．thatB．whereC．whenD．as

分析 我遇到这样一个情况：当我在上课时，一个男孩时而地小声与同桌说话．

解答 本题是考查定语从句，先行词是a case，则后面的定语从句的关系词有先2种情况；
1．如果定语从句缺少状语，其关系词才必须使用关系副词where
2．如果定语从句只缺少主语宾语时，则关系词还是使用which/that等
本题定语从句中的句子结构很完整，故使用关系副词，因为其后的定语从句如果缺少（地点）状语in…case（in which），此时in which等同于where．
当然这个where意思是"在…情况下"，只是一种引申理解的地点状语，而并非本来意义上即在某个具体地方的地点状语．故选B．

点评 点评：定语从句的考查主要集中在句子成分的分析．如果从句中缺少主语，宾语，表语定语使用关系动词．如果从句很完整，则使用关系副词．
修饰先行词case/point/situation/scene等抽象地点，where的意思相当于in which．case

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