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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

_____ the Internet is making people closer, it may also be breaking some homes or will cause other family problems.

The new shopping mall will be located in used to be a wasteland and a huge garden will be constructed there were numbers of tombs.

________ some people think advertisements bring much convenience, others are cautious about the tricks advertisements play on them.

We were having dinner _______ there was a knock on the door.

Patrick waited all the luggage was cleared, but his never appeared.

我正要给他打电话,这时他进来了。

①I {#blank#}1{#/blank#}him {#blank#}2{#/blank#}he came in.(be about to...when...)

②I {#blank#}3{#/blank#}him {#blank#}4{#/blank#}he came in.(on the point of...when...)

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