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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

The we recycle, the we waste.

A．more; more	B．more; less
C．many; many	D．much; little

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He ____ a good idea at the meeting.

A．came up with	B．came up
C．came out	D．catch up with

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He could hardly afford time and money on such an overseas vacation.

A．spending

B．to spend

C．spend

D．spent

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She often helps the students __ ___ she thinks are not good at English.

A．whom

B．which

C．who

D．when

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—Could I borrow your camera tomorrow?
—I don’t think you need it, because visitors ______ to take photos there.

A．aren’t allowed	B．don’t allow
C．haven’t allowed	D．hadn’t been allowed

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