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

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

【答案】A

【解析】句意:如果你不認(rèn)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當(dāng)……時候;D. since既然。根據(jù)you do everything carefully如果做事很認(rèn)真,應(yīng)該會成功,空格前應(yīng)該用肯定句才行,故排除B;選項CD都敘述的后面的是做事認(rèn)真,空格前敘述的是不會成功,不符合語境。故排除CD;unless=if not,根據(jù)句意故選A。

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