Bob has gone to California,I hear.Oh,I wonder when he ------- A leaves B left C was leaving D has left

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BobhasgonetoCalifornia,Ihear.Oh,Iwonderwhenhe-------AleavesBleftCwasleavingDhasleftBobhasgonetoCalif

Bob has gone to California,I hear.Oh,I wonder when he ------- A leaves B left C was leaving D has left
Bob has gone to California,I hear.Oh,I wonder when he ------- A leaves B left C was leaving D has left

Bob has gone to California,I hear.Oh,I wonder when he ------- A leaves B left C was leaving D has left
B 我想知道他什么时候走的(已经去加州了,说明“走”这个动作已经是过去了)

b