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Using a telescope we could see that something     .
A．is happeningB．happenedC．would happenD．was happening
D
考查時(shí)態(tài)。根據(jù)句意：使用望遠(yuǎn)鏡，我們能看見(jiàn)一些事情正在發(fā)生。因?yàn)橹挥姓诎l(fā)生的事情，我才能看見(jiàn)的，兩者是同時(shí)發(fā)生的。
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