Don’t promise anything ________ you are one hundred percent sure.
A．ifB．a(chǎn)fterC．whenD．unless
D

試題分析：if是否，如果；after在……之后；when當……時；unless除非，如果不。句意：如果你不是百分之百的確定，不要承諾任何事情。故選D。
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