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问题

The research they had been devoted to ______ to be of great value to the cancer patients

A:is proved
B:proves
C:has proved
D:proved
正确答案是:
同类题型

What time _____ your sister _____ to bed

Have you finished the book?—No I’ve read up to _____the children discover the secret cave [ ]

It ______ me two hours to find your newhouse.

If Joe’s wife does not go to the party , ________ .

The train is to start soon and Mary hasn’t turned up. What _____ have happened to her?

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