________ I came into the office, the teachers were having a meeting.
A.WhileB.WhenC.OnceD.Since在线课程B
解析:
while引导的从句中动词常常是表示延续的动词或表示状态的连系词be; when表示“当……的时候”;
once表示条件;
since表示时间时意思是“自从……”。根据句意可知选B项。
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