A (yes)
Have you ever seen that movie?
Yes,I have.
when I was in Tokyo,I saw it three times.
“when I was in Tokyo”,我理解成为一个补充成分,只是表明了一个过去的时间.它并不严格限制后面的时态,因而,不必用过去完成时.
在我呆在东京的时间内,我看过电影三次.
不能认为是过去的过去,
否则,意思成了："我看过电影三次” 早在 “我呆在东京的时候”