单项选择题

Nobody ever heard of him since then, ______

A.do they
B.did they
C.did he
D.didn’t he
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单项选择题
That little rocket had made scarcely any noise, ______
A.hadn’t it
B.had it
C.didn’t it
D.did it
单项选择题
You don’t believe that he has finished the difficult work all by himself, ______
A.do you
B.don’t you
C.has he
D.hasn’t he
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