填空题

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.
A. Even if
B. on
C. fuels
D. when

【参考答案】

D，改when为unless。

<上一题目录下一题>

热门试题

填空题

If two theories are equal to their ability to account for a body of data, the theory that does so with the smaller number of assumptions is to be preferred. A. to B. for C. does so D. to be preferred

填空题

All those left undone may sound greatly in theory, but even the truest believer has great difficulty when it comes to specifics. A. left undone B. greatly C. truest believer D. when

相关试题