You will not win the first prize ________ you work harder.
A. if                  B. unless                 C. or
B

試題分析：句意：除非你工作更努力點你就不會獲得一等獎。A. if如果； B. unless除非； C. or否則，根據(jù)句意“除非”是unless，相當于if not,所以此題選B。
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