题目内容

Using a telescope we could see that something     .
A．is happeningB．happenedC．would happenD．was happening
D
考查时态。根据句意：使用望远镜，我们能看见一些事情正在发生。因为只有正在发生的事情，我才能看见的，两者是同时发生的。
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