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You will fall behind others         you work hard.
A．until B．when C．after D．unless
D

試題分析：句意：如果你不努力，你將會落后于其他的人了。A. until直到……才； B. when 當……時候； C. after在……之后； D. unless除非，如果不。根據句意故選D。
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