单项选择题

It is very difficult for a child to adhere to rules.

A．remember
B．follow
C．understand
D．learn
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单项选择题
Tickets must be purchased two weeks in advance.
A．booked
B．bought
C．sold
D．obtained
单项选择题
The child's abnormal behavior puzzled the doctor.
A．bad
B．frightening
C．repeated
D．unusual
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