Mary won’t keep slim ______she takes exercise every day.

A. unless B. if C. when D. or

A

【解析】

試題分析：考查連詞。句意：瑪麗不會保持苗條除非她每天鍛煉。由題意可知前后是因果轉(zhuǎn)折關(guān)系，所以選A。

考點(diǎn)：考查連詞

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