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问题: 英语选择题

is this the reason ____at the meeting for his carelessness in his work?
A he explained
b what he explained
c how he explained
d why he explained
为什么不用D而用A

解答:

A对.理由:先排除B.C.(明白吧?),D中,explain及物动词,得有宾语,但why是副词,不能做宾语,故错了.A中,省略了关系代词which/that.另外:这是定语从句.在定语从句中,当关系代词做宾语时,可以省略.