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
B: mustn't they
C: haven't they
D: shouldn't they
正确答案是：
同类题型
I was born(出生) ________the morning _______February 25,1997
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Theyare going to go on a world tour they willperform in ten different cities.
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