While the boy ______ down the street, the UFO _____ .
A．was walking; was landing
B．walked; landed
C．was walking; landed
D．walked; was landing
C
考查時態(tài)：句意：當(dāng)男孩正沿著街道走的時候，不明飛行物著陸了，while引導(dǎo)的時間狀語從句經(jīng)常用過去進(jìn)行時態(tài)。主句用一般過去時，選C。
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