单项选择题

The experiment has（）the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.

A.found out
B.pointed out
C.ruled out
D.carried out

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单项选择题
People have always been （） about exactly how life on earth began.

A. curious
B. excited
C. anxious
D. careful
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Every year a flood of farmers arrive in Shenzhen for money-making jobs they （） before leaving their hometowns.

A. promised
B. were promised
C. have promised
D. have been promised
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