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 28．Our college is going to choose some from the graduates to serve the poor village during the summer vacation． A．volunteers B．firefighters C．employers D．prisoners
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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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