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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I don't care （） we are invited to the dinner or not.

A. if
B. that
C. whether
D. what
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It is reported that the police will soon （） the case of two missing children.

A. look upon
B. look after
C. look into
D. look out
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