{01}We were having a meeting _________ suddenly someone knocked at the door.
A.because
B.when
C.as
D.while
解析: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。 本题选B。 {02}It is ten years _____ I lived in Nanjing, so I know ____ about what it is like today.
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