—Bob has gone to California.
—Oh, can you tell me when he ?
A. has left
B. left
C. is leaving
D. would leave
网友回答
A. has left
(答案→)B. left
C. is leaving
D. would leave
解析：考查时态题。句意：鲍勃已经去了加利福尼亚。——你能告诉我他什么时候走的（已经去加州了，说明“走”这个动作已经是过去了）结合语境可知从句强调的是过去某事的动作，故用一般过去时态。选B。