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问题

In the past twelve months the research members ______ the effectiveness of many materials in a home building

A:had studied
B:would study
C:studied
D:have studied
正确答案是:
同类题型

Food will include buffalo that________________ over an open fire

52 _____ I went to the hospital to see Jack, who had _____ had an operation

_______does your brother watch TV every evening—Less than an hour.

s book, the word is used in its original sense unless ________ stated.

__ repeatedly, the problem still appeared in thebeginners’ homework

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