单项选择题

（）you start to feel worse than before, you will need to go to the hospital

A. As
B. Had
C. Should
D. Would

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单项选择题

（）Janet more outgoing, she would have more friends

A. Should
B. Were
C. Had
D. If

单项选择题

You won’t know if you like it （）you try it

A. once
B. for
C. since
D. unless

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