I ________ when the UFO landed.
A．a(chǎn)m watching TVB．was watching TV
C．have watched TV D．watched TV
B
本題的從句是過去時(shí)，故主句應(yīng)該是過去時(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，故用過去進(jìn)行時(shí)，結(jié)構(gòu)為was或were+doing，故選B。
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