You have to do those exercises______you want to perform poorly in the exam tomorrow.

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问题 You have to do those exercises______you want to perform poorly in the exam tomorrow.

选项 A、if
B、as
C、unless
D、provided

答案C

解析 if：如果；as：当……时，由于；unless：除非，如果不；provided：假如，倘若。根据句意可知，选C。

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