单项选择题

These three girls help______ to clean the house.

A．one another
B．each other
C．one and the other
D．one and other
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单项选择题
Though Mum is very busy, she always______ some time every day to read to her children.
A．sets off
B．sets in
C．sets aside
D．sets up
单项选择题
He is so wise a man that all the people______.
A．look him up
B．look into him
C．look up to him
D．look to him
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