单项选择题

Without the sun's light （）the earth's surface, no life could exist on the earth.

A．warms
B．warmed
C．warming
D．to warm

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单项选择题
This project is said （）right now and so far everything is going on quite smoothly.

A．to have carried out
B．having been carried out
C．to have been carried out
D．to be being carried out
单项选择题
After careful investigation we find that one of the statements （）to be untrue.

A．is turned out
B．have been turned out
C．has turned out
D．have turned out
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