They have () to China many time,They know a lot about China(要理由）They have () to China many time,They know a lot about ChinaA.come B.came C.go D.went

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They have () to China many time,They know a lot about China(要理由）They have () to China many time,They know a lot about ChinaA.come B.came C.go D.went
They have () to China many time,They know a lot about China(要理由）
They have () to China many time,They know a lot about China
A.come B.came C.go D.went

They have () to China many time,They know a lot about China(要理由）They have () to China many time,They know a lot about ChinaA.come B.came C.go D.went
They have (A.come) to China many time.They know a lot about China.
他们已经来过中国多次了.他们对中国很了解.
前句的时态是现在完成时,结构是助动词have加上动词的过去分词组成,表示到现在已经做过了.come的过去分词写法是不规则的,和原形写法一样.

a
have done所以因用过去完成时
come完成时是come
过去式came
所以选a
另外这个句子有问题。两个句子用逗号没有连词。

A
现在完成时的结构是HAVE/HAS +动词的过去分词，COME 的过去分词与原形相同，即 come
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