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Itwasdifficulttotellexactly

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问题详情:

Itwasdifficulttotellexactly

It was difficult to tell exactly _______ the saying began, but it is possible that it was in the theatre or movie industry.

A.where                            B.when                    C.why                            D.that 

【回答】

A

知识点:连词

题型:选择题

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