单项选择题

______ after the Second World War that test pilots first attempted to break the " sound barrier "

A. It was shortly
B. Until shortly
C. Shortly was it
D. Shortly
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You' d rather watch TV this evening, ______
A. isn't it
B. wouldn't you
C. hadn't you
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That is not impossible, ______
A. is that
B. isn' t that
C. is it
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