You should study harder______ it is too late to catch up.

A.ifB.whenC.a(chǎn)fterD.before

D

解析試題分析:if是否,如果;when當(dāng)……時(shí);after在……之后;before在……之前,以免。句意:你應(yīng)該努力學(xué)習(xí),不然太晚了,就來(lái)不及了。故選D。
考點(diǎn):考查連詞。

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