We were having a meeting _________ suddenly someone knocked at the door. A．because B．when .
Wewerehavingameeting_________suddenlysomeoneknockedatthedoor.A．becauseB．whenC．asD．whi...
We were having a meeting _________ suddenly someone knocked at the door. A．because B．when C．as D．while
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| 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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