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
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
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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