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题型：单选题题类：真题难易度：普通

We need to get to the root of the problem______ we can solve it.

A、while B、after C、before D、as

举一反三

______ scientists have learned a lot about the universe, there is much we still don't know.

While _____ dogs, people should take care not to ____. Otherwise, they may be dangerous to others.

The government has taken some measures to reduce the smog, but it may be some time _____ the situation improves.

{#blank#}1{#/blank#} regular exercise is very important, it's never a good idea to exercise too close to bedtime. (状语从句)

It is about ten years _____ I met you last time.

With the Entrance Exam approaching, I feel more and more stressed. It will ruin my college dream _____ I take action now as soon as possible.

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