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You can’t be successful ________ you do everything carefully.

A. unless B. if C. while D. since

A 【解析】句意:如果你不认真地的做每一件事情,你不可能成功的。A. unless如果不,除非;B. if如果;C. while当……时候;D. since既然。根据you do everything carefully如果做事很认真,应该会成功,空格前应该用肯定句才行,故排除B;选项CD都叙述的后面的是做事认真,空格前叙述的是不会成功,不符合语境。故排除CD;unless=if not,根...
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