单项选择题

Penicillin was discovered by chance in 1928.

A．finally
B．accidentally
C．experimentally
D．opportunely
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单项选择题
The Pop Art of the 1960’s used imagery drawn from the everyday world.
A．understood by
B．approved by
C．censored in
D．taken from
单项选择题
By the time the war broke out, most of the people had already left.
A．began
B．spoiled the country
C．became less widespread
D．intervened
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