单项选择题

Language is a city, to the building of（）every humanbeing has brought a stone.

A. which
B. that
C. it
D. what

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单项选择题

She apologized（）the mess she had made, but her parents were still very angry.

A. at
B. on
C. with
D. for

单项选择题

With the population explosion, scientists will have to（）new methods of increasing the world's food supply.

A. come up with
B. carry out
C. lead to
D. stick to

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