问题

There’s no light on in the dormitory. They must have gone to attend the concert to be held on the campus, ________?[ ]

A: didn't they
B: mustn't they
C: haven't they
D: shouldn't they

正确答案是：

同类题型

241. I am leaving in an hour but I haven’t_____ my clothes into my trunk.

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as the first cropsfrom one continent to another________, helping to develop local economies withthese new imports

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