—Was it under the tree you were away talking to a friend?
—Sure. But when I got back there, the bike was gone.
A. that
B. where
C. which
D. while
网友回答
A. that
B. where
C. which
(答案→)D. while
解析：考察连词辨析。Where在哪里；which哪一个；while当…时；本句中的it是一个代词，指代the bike，句意：当你去和朋友谈话的时候，自行车是在大树下下面吗？—当然。但是当我回到那里的时候，自行车以后不见了。根据句意说明D正确。