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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单项选择题
______, we decided to go swimming in the sea.
A．It being a fine day
B．The day was fine
C．It was a fine day
D．Being a fine day
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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