2. 外语
  3. Scientists think ______ helps some trees to conserve water in winter.

Scientists think ______ helps some trees to conserve water in winter.

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问题 Scientists think ______ helps some trees to conserve water in winter.
选项 A、when losing leaves
B、leaves are lost
C、that losing leaves
D、the leaves losing
答案C
解析 不定式作主语，表示比较具体的动作，或表示说话者的某种看法；而动名词作主语则表示某个一般性的动作，或表示说话者的亲身经历，如：It would kill him to work like this 24 hours on end．像这样连续24小时不停地工作会累死他的。It would kill him working hard 24 hours on end．连续24小时卖力地工作会累死他的。
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