问题描述：
( )20.— Jim,come back.Your new book is still on the sofa.— Oh,thank you.I have forgotten __
A.to put B.put C.putting D.to putting
( ) 1.Susan be here now because she has just gone to New York.
A.mustn’t B.can’t C.needn’t D.may not
选什么
A.to put B.put C.putting D.to putting
( ) 1.Susan be here now because she has just gone to New York.
A.mustn’t B.can’t C.needn’t D.may not
选什么
问题解答：
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