单项选择题

There is much work to be done __________ we remember something forever.

A．after
B．when
C．unless
D．before
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单项选择题
The man's mind is something like a __________.
A．photograph
B．cinema
C．picture
D．camera
单项选择题
Some people can easily learn things but they __________ them easily, too.
A．forget
B．realize
C．remember
D．fail
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