This is the third time I _____ the Great wall.A.came to visit B.am on C.have come to visit D.am visiting

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This is the third time I _____ the Great wall.A.came to visit B.am on C.have come to visit D.am visiting

This is the third time I _____ the Great wall.A.came to visit B.am on C.have come to visit D.am visiting
This is the third time I _____ the Great wall.
A.came to visit B.am on
C.have come to visit D.am visiting

This is the third time I _____ the Great wall.A.came to visit B.am on C.have come to visit D.am visiting
This is the third time I __have come to visit___ the Great wall.
This is\was the +序数词+time +句子(现在完成时\过去完成时)

应该用现在完成时
这里的come 是 come的过去分词 不是原形 所以选C

固定搭配。。。

现在完成时的用法句型