【題目】— Shall we begin our trip at once?

No. We won’t set off________our head teacher agrees.

A.ifB.whileC.unless

【答案】C

【解析】

句意:——我們可以馬上開始我們的旅行嗎?——不,除非我們的班主任同意,否則我們不會(huì)出發(fā)。

考查連詞辨析。if如果,引導(dǎo)條件狀語從句;是否,引導(dǎo)賓語從句;while當(dāng)……時(shí)候,引導(dǎo)時(shí)間狀語從句;unless除非,如果不,引導(dǎo)條件狀語從句。根據(jù)句意可知,這里表示“如果班主任不同意,我們就不能……”,故選C。

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