问题

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

正确答案是：

同类题型

Pity you missed the lecture on nuclear pollution.—I________it, but I was busy preparing for a job interview.(2011·福建)

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We students can _______ food and old clothes to the homeless people, and the teachers can __________ learning skills for the poor children.

The audience into laughter when the clown took a fall.

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