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  3. The data showed that there are up to 20 times more lightning flashes within clou

The data showed that there are up to 20 times more lightning flashes within clou

游客2024-09-04  45
问题 The data showed that there are up to 20 times more lightning flashes within clouds______by the ground-based network.
选项 A、than they observe
B、than what have been observed
C、as what is observed
D、than are observed
答案 D
解析 比较级题。根据选项和题干中的more可确定本题考查than的用法。本题可把than看作关系代词，充当句子主语。例如句子“I spent more money than was intended to be spent．”也有解释为than从句省略主语。注意than连接从句时具有省略性、倒装性和对称性特点。本题空格后为by，同时根据含义，具有被动含义，且从句表示的是现存的事实，故D为本题答案。
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