2. 外语
  3. Wind motion can be observed in the atmosphere by ______ the trails of meteors passing through it.

Wind motion can be observed in the atmosphere by ______ the trails of meteors passing through it.

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问题 Wind motion can be observed in the atmosphere by ______ the trails of meteors passing through it.
选项 A、to watch
B、watching
C、watched
D、watch
答案B
解析 英语中，一般只能用动名词作介词的宾语，如：You were in fault for speaking to your ,son in such a rude manner．你对儿子讲话如此粗鲁是错误的，We are not alone in thinking that the experiment is not successful．并非只有我们认为这项实验是不成功的。
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