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I'm afraid your suggestion can't help ( )hte service of thei

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I'm afraid your suggestion can't help ( )hte service of their shop.
我选的是A.improving但答案是选Cimprove,为什么呢?此外还有答案B .in improving for improving求讲解!
I'm afraid your suggestion can't help ( )hte service of thei
help (to)do对做什么事有帮助,这个不定式在主动语态可以省略掉,但要注意 的是在被动式使用时不能省略.如he was helped to finish the exercise.
can't help doing,这个固定结构的意思是“忍不住做(了)某事
所以应该是improve才正确