(No wonder) that (man’s) great dream has been someday to control the weather. The first step toward control is, of course, knowl

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问题 (No wonder) that (man’s) great dream has been someday to control the weather. The first step toward control is, of course, knowledge, and scientists have been (hard at work) for years trying to (keep track with) the weather.

选项 A、No wonder
B、man’s
C、hard at work
D、keep track with

答案D

解析
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