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题型：单选题题类：真题难易度：普通

--There ______ many trees at the foot of the mountain.--But now they are slowly disappearing because of human activities.

A、 is used to B、 used to C、 used to be

举一反三

A good listener must asking questions.

There is no bridge the river, so we the river by boat.

Mr．Smith is still busy today like any other ．

Mr Wang often goes to work___________.

You should wait. It's too dangerous ________ the road when the traffic light is red.

Our teacher often w{#blank#}1{#/blank#} us not to leave personal information on the Internet.

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