I didn't know he came back ______ I met him in the street.


  1. A.
    since
  2. B.
    when
  3. C.
    until
  4. D.
    after
C
解析：
句意為“直到在街上見到他，我才知道他回來了”。not...until...是固定結(jié)構(gòu)。意為“直到……才”。故選C。
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