单项选择题

To carry out the plan successfully, we have to get well prepared ______.

A．in detail
B．in turn
C．in advance
D．in force
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单项选择题
If you suspect that the illness might be serious you should not ______ going to the doctor.
A．put off
B．put aside
C．hold back
D．hold up
单项选择题
By the year of 2010, the world population probably ______ 6 billion.
A．have reached
B．will be reaching
C．will have reached
D．is reaching
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