问题
选择题
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
答案
答案：A
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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
答案：A