【題目】This problem may lead to more serious ones if ________ unsolved.

A. making B. remained C. keep D. left

【答案】D

【解析】句意：如果這個(gè)問(wèn)題仍然未被解決，將會(huì)導(dǎo)致更嚴(yán)重的問(wèn)題。只有l(wèi)eft和remain可以表示“剩下的”；條件從句是省略句，省略了主語(yǔ)和be動(dòng)詞，還原應(yīng)為the problem is left unsolved. B項(xiàng)remain為不及物動(dòng)詞，不能用被動(dòng)形式。故選D。

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