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A)单项填空 从题中所给的A、B、C三个选项中选出最佳答案填空。(共10小题，计10分)
( )21. These CDs __________ me nearly fifty yuan.
A.took B.spent C. cost[来源:Z&xx&k.Com]
( )22.My sister could swim _____________ she was only five.
A. before B. when C.at the age of
( )23. Sandy______go to see the dentist. He has a serious toothache.
A.has to B. can C mustn’t
( )21. These CDs __________ me nearly fifty yuan.
A.took B.spent C. cost[来源:Z&xx&k.Com]
( )22.My sister could swim _____________ she was only five.
A. before B. when C.at the age of
( )23. Sandy______go to see the dentist. He has a serious toothache.
A.has to B. can C mustn’t
