She won’t lose weight ___ she keeps a diet and takes exercise every day.
A．ifB．whenC．unlessD．as if
C

試題分析：句意：假如她每天不節(jié)食并且做運動，她將減不了肥unless如果…..不，除非；if假如；when當…..時候；as if好像。根據(jù)句意故選C。
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