单项选择题

In order to stay healthy, it is a good idea ______ your doctor at least once a year.

A．visits
B．to visit
C．that visits
D．visited
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单项选择题
Scarely had I reached there ______ it began to rain.
A．than
B．that
C．when
D．while
单项选择题
A ______ is a formal or official agreement made between persons, groups, institutions or states.
A．contract
B．contact
C．contrast
D．contest
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