The doctor will not perform the operation it is absolutely necessary.A. whenB. ifC. forD.

发布时间：2020-08-16 08:00:19

The doctor will not perform the operation      it is absolutely necessary.
A. when
B. if
C. for
D. unless

网友回答

A. when
B. if
C. for
(答案→)D. unless
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