While the boy ______ down the street, the UFO _____ .


  1. A.
    was walking; was landing
  2. B.
    walked; landed
  3. C.
    was walking; landed
  4. D.
    walked; was landing
C
本題是考查while 引導(dǎo)的從句,其中主句為短暫性動詞,從句為延續(xù)性動詞,且主句的動作發(fā)生在從句的動作中,故選C
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