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
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
Only once in his life had Douglas permitted himself ______ control of his emotions.
A．to lose
B．lost

C．lose
D．losing
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