单项选择题

Encouragement through praise is the most effective method of getting people ______ their best.

A．do
B．to do
C．doing
D．done
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单项选择题
The (principal) mason for the great (number) of smoke is (that) there are (too many) factories in this are
A． principalB. numberC. thatD. too many
单项选择题
A．madeB．doneC．finishedD．performed
A．made
B．done
C．finished
D．performed
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