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题型：单选题题类：常考题难易度：普通

He made a mistake, but then he took action to change the situation ________ it got worse.

A、until B、when C、before D、because

举一反三

People in North China eat noodles as their main food ___ people in the south eat rice.

——When did your father come back last night?
——He didn't come back _______ he finished all the work.

Peter was so excited _______ he received the invitation to the important meeting.

_______jeans were invented（发明）over 100 years ago, they're still in fashion now.

当妈妈在做饭时, 我正在看电视。

{#blank#}1{#/blank#} my mother was cooking, I {#blank#}2{#/blank#} {#blank#}3{#/blank#}TV.

Before you ask someone for help, find out he is the right person for your problem.

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