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It is only with the help of scientific research _____ bring PM1 air pollution under control.

A．that we will	B．we will
C．that we do	D．do we

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相关试题

. The glass doors have taken the place of the wooden ones at the entrance, __________ in the natural light during the day.

A．to let	B．letting
C．let	D．having let

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. Peter received a letter just now __________ his grandma would come to see him soon.

A．said	B．says
C．saying	D．to say

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--- I’m sorry. I ___________ at you the other day.
--- Forget it. I was a bit out of control myself.

A．shouldn’t shout	B．shouldn’t have shouted
C．mustn’t shout	D．mustn’t have shouted

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To learn English well, we should find opportunities to hear English ___________ as much as we can.

A．speak

B．speaking

C．spoken

D．to speak

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--- I’m sure Andrew will win the first prize in the final.
--- I think so. He ___________ for it for months.

A．is preparing

B．was preparing

C．had been preparing

D．has been preparing

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