题目内容

What ________ when they ________ last Thursday?


  1. A.
    did you do; were seeing me off
  2. B.
    were you doing, saw me off
  3. C.
    did you do, saw off me
  4. D.
    were you doing, were seeing me off
B
B主从复合句中,同时发生两个动作,长动作用进行时,短动作用一般式。
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