【題目】There will be less pollution ___more people use public transportation .
A.but
B.though
C.unless
D.if

【答案】D
【解析】句意:如果更多的人使用公共交通,將會有更少的污染。A. but但是,表示轉(zhuǎn)折;B. though雖然,然而,表示轉(zhuǎn)折;C. unless如果不,除非,表示相反的條件;D. if如果,表示條件。如果更多的人使用公共交通工具,污染就會越來越少,表示條件,用if。故選D。

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