---I have been to Hangzhou once(需解释) ---when____you_____there?A.did go B.have gone C.have been----I have been to Hangzhou once(需解释) ----when____you_____there?A.did,go B.have,gone C.have,been

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---I have been to Hangzhou once(需解释) ---when____you_____there?A.did go B.have gone C.have been----I have been to Hangzhou once(需解释) ----when____you_____there?A.did,go B.have,gone C.have,been

---I have been to Hangzhou once(需解释) ---when____you_____there?A.did go B.have gone C.have been----I have been to Hangzhou once(需解释) ----when____you_____there?A.did,go B.have,gone C.have,been
---I have been to Hangzhou once(需解释) ---when____you_____there?A.did go B.have gone C.have been
----I have been to Hangzhou once(需解释) ----when____you_____there?A.did,go B.have,gone C.have,been

---I have been to Hangzhou once(需解释) ---when____you_____there?A.did go B.have gone C.have been----I have been to Hangzhou once(需解释) ----when____you_____there?A.did,go B.have,gone C.have,been
A
WHEN 不能与现在完成时连用.

选A
后面的问句只是对过去情况的一个提问,所以直接用一般过去时即可。
翻译:
——我去过杭州一次。
——你什么时候去的?

我曾经去过杭州一次。
你什么时候去的?
对过去的事实提问,用一般过去式,选A