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It is pretty well understood _______ controls the flow of carbon dioxide in and out the atmosphere today.

A．that	B．when
C．what	D．how

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相关试题

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

A．Seeing

B．Seen

C．To see

D．See

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

A．When

B．Whenever

C．Whether

D．If

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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

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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

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He raised his voice in order to make himself ________ by all the people present.

A．hear

B．hearing

C．to hear

D．heard

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