【題目】You’ll get a toothache ______ you clean your teeth regularly.

A.becauseB.whenC.ifD.unless

【答案】D

【解析】

句意:你會(huì)牙疼,除非你有規(guī)律的刷牙。

You’ll get a toothacheyou clean your teeth regularly可知是除非;because因?yàn)椋?/span>when當(dāng)……時(shí)候,if如果,unless除非;故選D

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