题目内容
【题目】They didn't discover until they happened to enter the back room _________ someone had stolen the priceless painting.
A.thatB.whatC.whichD.when
【答案】A
【解析】
考查宾语从句连接词。句意:直到他们碰巧进入后屋,才发现有人偷了那幅无价的画。分析句子可知,“有人偷了那幅无价的画”在句中作动词discover的宾语,所以是宾语从句,从句缺少引导词,而宾语从句中又不缺少任何成分,所以用连接词that引导该宾语从句。因为that在名词性从句中不做成分,无词意,而其它几个选项都是要在从句中做一定的句子成分的。故选A。

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