I was watching TV in the room I heard a knock on the door.A.whileB.whenC.as soon
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I was watching TV in the room ________ I heard a knock on the door.
A.while
B.when
C.as soon as
D.until
试题答案
B

I was watching TV in the room ________ I heard a knock on the door.
A.while
B.when
C.as soon as
D.until
B