They have some problems ____ for the party.A, prepare B, to prepare C, prepared D, preparing答案是D,怎么解释?

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They have some problems ____ for the party.A, prepare B, to prepare C, prepared D, preparing答案是D,怎么解释?
They have some problems ____ for the party.
A, prepare B, to prepare C, prepared D, preparing
答案是D,怎么解释?

They have some problems ____ for the party.A, prepare B, to prepare C, prepared D, preparing答案是D,怎么解释?
have problems in doing something
在做.的时候有麻烦或者问题,但是介词in一般省略,所以选最后一个

Have problems或Difficulties in doing sth,其中介词In可省略,肯定正确的。

have some problems (on) doing sth
做什么事情遇到了点麻烦。一般on省略

have difficult / problem (in) doing sth
意思是做什么事情有困难,In 通常省略