单项选择题

Hardly ______ when the lights went out.

A．the performance had begun
B．had the performance begun
C．the performance began
D．did the performance begin
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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
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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