单项选择题

Since his children have all grown up, he has nothing now.()

A.to worry about
B.worrying about
C.to be worried
D.worried

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单项选择题
She has been looking forward () her parents.

A.to meeting
B.for meeting
C.being met
D.to meet
单项选择题
() is a good form of exercise for both young and old.

A.Walking
B.To walk
C.The walk
D.Walk
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