I ________ when the UFO landed.
A.a(chǎn)m watching TVB.was watching TV
C.have watched TV D.watched TV
B
本題的從句是過(guò)去時(shí),故主句應(yīng)該是過(guò)去時(shí)的一種,本題的含義是UFO著落的當(dāng)時(shí)我做的事情應(yīng)該是正在發(fā)生,故用過(guò)去進(jìn)行時(shí),結(jié)構(gòu)為was或were+doing,故選B。
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