【題目】The river will be dirtier and dirtier________we do nothing to protect them.

A.since

B.if

C.unless

D.until

【答案】B

【解析】設(shè)空前句意為河流會(huì)變得越來越臟,設(shè)空后句意為我們不保護(hù)它們,由此可知所缺的連詞是if。

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