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—I’m busy with my schoolwork these days.
—That’s great! You won’t get good grades ______ you work hard.
A．ifB．because
C．unlessD．after
C

試題分析：句意：這些天我忙著學校工作。那太好了，除非你努力工作，否則你不會取得好成績。A. if如果； B. because因為； C. unless除非； D. after在……之后，根據句意此題選C。
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