【題目】How can we improve our environment a lot each of us does something useful for it?

A. whileB. untilC. afterD. unless

【答案】D

【解析】

句意:除非我們每個人都做一些有益的事情,否則我們?nèi)绾尾拍艽蟠蟾纳莆覀兊沫h(huán)境呢?考查連詞辨析。while當(dāng)……的時候,表時間;until直到,表時間;after在……之后,表時間;unless除非,表條件。本句是條件狀語從句,根據(jù)句意結(jié)構(gòu)和語境,可知選D

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