单项选择题

The teacher recommended that Jack______ math or physics instead of English because he was quick at numbers.

A．must study
B．could study
C．study
D．studied
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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
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
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