单项选择题

When you have finished that book, don’t forget to put it on the bookshelf, ().

A. do you
B. will you
C. don’t you
D. won’t you

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单项选择题
34().

A.decrease
B.sources
C.shortage
D.reduction
单项选择题
It was only after some progress () in the use and development of electric current that men began to realize the importance and possibilities of magnetism.

A. had been made
B. would have been made
C. has been made
D. was made
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