单项选择题

His marked personality changes were brought about by a series of unfortunate events.

A．preceded
B．accompanied
C．caused
D．hastened
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单项选择题
Penicillin was discovered by chance in 1928.
A．finally
B．accidentally
C．experimentally
D．opportunely
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
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