单项选择题

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

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

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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
单项选择题
I remember () to the zoo by my father when I was a child.

A. to be taken
B. had been taken
C. being taken
D. to be taking
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