问题
选择题
We were having a meeting _________ suddenly someone knocked at the door.
A．because
B．when
C．as
D．while
答案
答案：B
考查固定结构。Be doing sth. when…正在做某事，这时……；when在这是并列连词。选B。
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We were having a meeting _________ suddenly someone knocked at the door.
A．because
B．when
C．as
D．while
答案：B
考查固定结构。Be doing sth. when…正在做某事，这时……；when在这是并列连词。选B。