I knocked at the door for more than five minutes Mr. Smith answered it.A.untilB.
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I knocked at the door for more than five minutes ________ Mr. Smith answered it.
A.until
B.when
C.after
D.before
试题答案
A

I knocked at the door for more than five minutes ________ Mr. Smith answered it.
A.until
B.when
C.after
D.before
A