摘要：27．Yesterday I was about to leave for the market my boss called and asked me to go back to the office at once． A．when B．while C．as D．because
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Yesterday I was about to leave for the market ________ my boss called and asked me to go back to the office at once．
- A.when
- B.while
- C.as
- D.because
Yesterday I was about to leave for the market _____ my boss called and asked me to go back to the office at once．
A．when B．while C．as D．because
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