Beforeaproblemcanbesolved，itmu

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更新 2022-09-03
科目英语
题型单选题
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挑错有奖

Before a problem can be solved，it must be obvious____the problem itself is.

A．what

B．that

C．which

D．why

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____ the news, so far, has been good, there may be bad days ahead.

A．When

B．While

C．If

D．As

题型：未知
难度：未知

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Not until the train pulled into the next station ____ her suitcase gone.

A．Mary had found

B．had Mary found

C．did Mary find

D．Mary found

题型：未知
难度：未知

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Since 1994, the glacier in Antarctica has lowered by as much as 90cm, ____sea level to rise.

A．having caused

B．causing

C．caused

D．being caused

题型：未知
难度：未知

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—Flight MU257 ____ . I must be off now.
—Have a nice trip.

A．is being announced

B．has announced

C．was announcing

D．had been announced

题型：未知
难度：未知

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When ____ comes to saving energy, big changes start with small steps, like turning off the lights.

A．that

B．this

C．it

D．one

题型：未知
难度：未知

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