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They wanted to know_____________.请问这道选择题应该选哪项,为什么,

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They wanted to know_____________.请问这道选择题应该选哪项,为什么,
A.why he didn't think it was a good idea
B.why he thinks it was not a good idea
C.why he thought it was not a good idea
D.why didn't he think it was a good idea
A
宾语从句是陈述语序,排除D , 主句是一般过去时,从句要用相应的过去时,再排除B ,从句he thought it was not . 要用否定前移,再排除C