题目内容

Yesterday I was about to leave for the market ________ my boss called and asked me to go back to the office at once.


  1. A.
    when
  2. B.
    while
  3. C.
    as
  4. D.
    because
A
解析:
…be about to do sth when…固定句型,表示“……正要……此时……”。
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