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( )11.John _____ spend all his pocket money,but now he _____

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( )11.John _____ spend all his pocket money,but now he _____ saving some of it .
( )11.John _____ spend all his pocket money,but now he _____ saving
some of it .
A.was used to ,used to B.used to ,used to
C.was used to ,is used D.used to ,is used to
为什么选D不选B,请详解,
约翰过去花光他所有的零花钱,但现在他已经习惯于把一些零钱存起来
used to do sth过去常干某事
be used to doing sth现在习惯于做什么
所以选D
再问: 习惯于做某事的用法是be used to doing还是used to doing,其中的be一定得有吗?
再答: 习惯于做某事 be used to ding 一定要用be