17.I can't go out now,I _____ look after my baby sister.( )
A. | can | B. | mustn't | C. | have to | D. | needn't |
16.Every year in April,the Water Festival ______ among the Dai people in Xishuangbanna.( )
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A. | celebrates | B. | is celebrating | ||
C. | is being celebrated | D. | is celebrated |