【題目】Jack won't do well in English ______ he works hard at it.

A. after B. if C. unless D. because

【答案】C

【解析】句意：杰克英語將會不好，除非他努力學(xué)它。A. after 在---以后； B. if如果； C. unless 除非； D. because因?yàn)�；根�?jù)Jack won't do well in English和he works harder at it.之間的關(guān)系，應(yīng)是除非；故選C。

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