You should study harder______ it is too late to catch up.A．ifB．whenC．afterD．befo
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You should study harder______ it is too late to catch up.| A．if | B．when | C．after | D．before |
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答案
| D |
解析
试题分析：if是否，如果；when当……时；after在……之后；before在……之前，以免。句意：你应该努力学习，不然太晚了，就来不及了。故选D。 |
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