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Havingcheckedeverything,hesatdowntodohishomework,

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问题详情:

Havingcheckedeverything,hesatdowntodohishomework,

Having checked everything, he sat down to do his homework, __________ he heard a lightening strike the electricity pole in the backyard.

       A.for                  B.when               C.or                D.but

【回答】

B

知识点:连词

题型:选择题

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