【題目】_______we make an effort to prepare carefully, we may fail the coming exam.

A.WhenB.IfC.SinceD.Unless

【答案】D

【解析】

句意:除非我們努力認(rèn)真準(zhǔn)備,否則我們可能會(huì)考試不及格。

考查連詞辨析。When當(dāng)……的時(shí)候;If如果;Since自從;Unless除非。根據(jù)____we make an effort to prepare carefully, we may fail the coming exam.可知前句是后句的條件,而且是否定的條件,所以用unless引導(dǎo),unless相當(dāng)于if not,故答案選D。

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