ithavebeenthefailuretopickupdi

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更新 2022-09-03
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挑错有奖

______ it have been the failure to pick up directions from the ground control that caused the air crash?

A．Must

B．Could

C．Would

D．Should

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It was not until he became very ill ______ he went to see a doctor.

A．what

B．that

C．when

D．then

题型：未知
难度：未知

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______ from the moon, the earth looks like a beautiful blue planet.

A．Seeing

B．Seen

C．To see

D．See

题型：未知
难度：未知

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___we do this today or tomorrow doesn’t make much difference.

A．When

B．Whenever

C．Whether

D．If

题型：未知
难度：未知

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—Do you think I should wear a thick coat?
—Yes, certainly. ______, you also need a compass.

A．What’s more

B．In other words

C．Keep in touch

D．On the contrary

题型：未知
难度：未知

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Only when he arrived home _____ that he had left his key in the office.

A．will he realize

B．he did realize

C．did he realize

D．should he realize

题型：未知
难度：未知

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