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问题

The operation room in every hospital has to ______ bacteria of any kind.

A:keep free from
B:make it free from
C:be made free from
D:be kept free from
正确答案是:
同类题型

-What did you think of the place–I didn’t care for it at first, but after _____ time I got to like it.

_______ that we were watching hisevery move, so he seemed to be going his own way in this business

__________leaves the room last ought to turn off the lights.

The ____ bell has been repaired by an _____ engineer.

How long have you known John? — Since he ______ to our class

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