英语语法问题Is this the first time you have visited Tokyo?have vis

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英语语法问题
Is this the first time you have visited Tokyo?
have visited可不可以用visited?
Peter has just arrived,and I didn't know he _B_ until last night.
A.had come B.was coming C.will come D.is to come
为什么不是A?
3Q

1.这是个句型：
It is/ This is疑问句Is it/ Is this the first(second...) time后面的that从句要用现在完成时have visited.主句中的is如改成was,从句要用过去完成时had visited.
不可以用一般过去时visited.
2.因为I didn't know是过去时,所以从句中只能用相应的过去时形式.C和D可以被排除.根据句意：.“直到昨天晚上我才知道他要来”不是表示“过去的过去”所以不能用过去完成时had come,而要用was coming过去进行时来表示“过去的将来”.

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