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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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

单项选择题

______ there was no enough evidence, most people thought he was guilty.

A．That
B．If
C．Unless
D．Although

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