摘要：We can’t do well in examination we study hard in school time.( ) A.if B.and C.since D.unless 答案:D 联系上下句应该是表达“如果不--.我们就无法-- 这样一种含义.unless=if...not,符合句意.
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We can’t do well in examination _________ we study hard in school time.
A.if B.and C.since D.unless
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We can’t do well in examination _________ we study hard in school time.
| A．if | B．and | C．since | D．unless |