----He is fluent in English because he once stayed in London ．
---- Really ? How long there ?
A. did he live
B. has he lived
C. had he lived
D. does he live
网友回答
(答案→)A. did he live
B. has he lived
C. had he lived
D. does he live
解析：考查时态。句意：他说英语说的很流利因为他曾经在伦敦住过。真的吗？他在那住了多久？居住的动作在过去，现在已经不住了，所以用一般过去式，选A。