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15.People have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget them every time a new source of cheap energy is developed. (A) have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget (B) have discovered the principles of solar energy whenever fuel has become scarce and expensive but they forget (C) discovered the principles of solar energy every time fuel becomes scarce and expensive, forgetting (D) discover the principles of solar energy every time fuel became scarce and expensive, but they forget (E) discover the principles of solar energy whenever fuel becomes scarce and expensive but forget 答案选E,我选了D,因为看到没画线的部分有every time,觉得画线的也这么用对称呢~D中的they是否是可以既指代人又指代物呢?感觉指代不清呢 |
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