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题型：单选题题类：常考题难易度：容易

We are now short fresh water. Something must be done to prevent people polluting it.

A、of；from B、for；from C、of；to

举一反三

____the end of the day, we were very tired.

It was her _____ performance(表演). Her successful career _____ only 10 years.

I haven't seen Kate for a few days. I last saw her{#blank#}1{#/blank#}Tuesday.

It was really helpful him to take the cat to the animal centre a rainy night.

Paul thinks Yu Gong could build a road instead of {#blank#}1{#/blank#} (move) the mountains.

星期天，我在电脑上看了一场棒球比赛。

{#blank#}1{#/blank#} Sunday I {#blank#}2{#/blank#} a baseball game on the computer.

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