他们又过了七年才结婚。

　　注意：当主句的谓语动词为延续性动词时，before与until有时可以互换。It was an hour before/until the police arrived.

　　巩固练习

　　⒈It was evening ________ we reached the little town of Winchester.

　　Athat B.until C.since D.before

　　2.Several weeks had gone by ________ realized the painting was missing.

　　A.as B.before C.since D.when

　　3.The America Civil War lasted four years ______ the North won in the end.

　　A.after B.before C.when D.then

　　4.It was some time _______ we realized the truth.

　　A.when B.until C.since D.before

　　5.-Why didnt you tell him about the meeting?

　　-He rushed out of the classroom _______ I could say a word.

　　A.before B.until C.when D.after

　　6.-How long do you think it will be __ china sends a manned spaceship to the moon?

　　-Perhaps two or three years.

　　Awhen B.until C.that D.before

　　参考答案：DBBDAD

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