题目内容

I ________ when the UFO landed.
A．am watching TVB．was watching TV
C．have watched TV D．watched TV
B
本题的从句是过去时，故主句应该是过去时的一种，本题的含义是UFO着落的当时我做的事情应该是正在发生，故用过去进行时，结构为was或were+doing，故选B。
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