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单项选择题
A.Bid
B.To bid
C.Bidding
D.To be bidden
单项选择题
A.Spending
B.To spend
C.Spend
D.Spended
单项选择题
A.finish
B.finishing
C.to have finished
D.finished
单项选择题
A.swim
B.swimming
C.to be swimming
D.to go to swim