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  3. (Even if) automakers modify commercially produced cars to run (on) alternative (fuels), the cars won’t catch on in a big way (wh

(Even if) automakers modify commercially produced cars to run (on) alternative (fuels), the cars won’t catch on in a big way (wh

admin2008-12-26  51
问题 (Even if) automakers modify commercially produced cars to run (on) alternative (fuels), the cars won’t catch on in a big way (when) drivers can fill them up at the gas station.
选项 A、Even if
B、on
C、fuels
D、when
答案D
解析 改when为unless。本题考查连接词的用法。从句意看，讲话人是在谈论一种新型的、靠多种代用燃料作动力的汽车，而这种汽车无论用何种代用燃料，它首先必须能在加油站加燃料才能得到司机们的青睐。因此，此处需要一个连词来引导条件从句而非时间从句，所以应将when改为unless，意为"除非、如果不"，相当于if…not...。
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考研英语一

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