【題目】—One can't be successful ________ he or she keeps working hard.

—I agree with you.

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

【答案】B

【解析】句意：-一個人如果不努力工作，就不會成功。-我同意你的看法。A. although即使，引導(dǎo)讓步壯語從句；B. unless除非、如果不，引導(dǎo)條件狀語從句；C. because因為，引導(dǎo)原因狀語從句；D. if如果，引導(dǎo)條件狀語從句。故選：B。

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