单项选择题

The millions of calculations involved, () by hand, would have lost all practical value by the time they were finished.

A. had they been done
B. having been done
C. they had been done
D. they were done

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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
单项选择题
34().

A.decrease
B.sources
C.shortage
D.reduction
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