单项选择题

A．since
B．while
C．for
D．when
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单项选择题
A．have writtenB．to be writtenC．are writtenD．write
A．have written
B．to be written
C．are written
D．write
单项选择题
A．a number ofB．many ofC．a lot ofD．a few of
A．a number of
B．many of
C．a lot of
D．a few of
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