What were you doing ______there was a knock at the door?A.while B.until C.when D.after

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What were you doing ______there was a knock at the door?A.while B.until C.when D.after
What were you doing ______there was a knock at the door?A.while B.until C.when D.after

What were you doing ______there was a knock at the door?A.while B.until C.when D.after
C
指的是一个时点

C

c