Measures must be taken before there is another collapse of the coal mine, ?A. must theyB.

发布时间：2020-08-16 08:10:25

Measures must be taken before there is another collapse of the coal mine,     ?
A. must they
B. mustn’t they
C. is there
D. isn’t there

网友回答

A. must they
(答案→)B. mustn’t they
C. is there
D. isn’t there
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