【題目】There's no snake that will habitually(習(xí)慣性地)attack humans__________ it is in danger.

A.unlessB.ifC.thoughD.since

【答案】A

【解析】

句意:沒(méi)有蛇會(huì)習(xí)慣性地攻擊人類,除非它處于險(xiǎn)境。

考查連詞。A. unless除非;B. if如果;C. though雖然;D. since因?yàn)、既然。由于前半句句意是否定的,所以后半句?yīng)是否定意義的連詞引導(dǎo),整個(gè)句意才通順,故選A。

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