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Every possible means _______ to prevent the crash , but the computer doesn’t still work．

A．is used	B．are used
C．has been used	D．have been used

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The plan _____ by the Chinese government ____ rejuvenating the nation by relying on science.

A．put forward, aimed at	B．was put forward, aiming at
C．put forward, was aimed at	D．put forward, aiming at

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---I apologized for_____ to tell you when and where the meeting will be held in advance.

A．my being not able	B．me not to be able
C．my not being able	D．me to be not able

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Most birds find it safe to sleep in the trees, but _____ they have eggs or young chicks, they don’t use a nest.

A．why

B．how

C．unless

D．where

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---What were you doing when Tom came to see you?
---I had just put on my overcoat and_____ to visit my friends.

A．left

B．was left

C．was leaving

D．had left

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As ______along the river bank, she was singing a pop song.

A．walking

B．walked

C．to walk

D．walk

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