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
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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
单项选择题
Tell me how to operate the computer, ______
A.don’t you
B.will you
C.shall we
D.do you
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