When I walked past the park,I saw s ome people(

题目

When I walked past the park,I saw s ome people(
When I walked past the park,I saw s
ome people( )Chinese Taiji.
A.did
B.to do
C.are doing
D.doing

答案

选择D选项,句子大意是我路过公园时,看到一些人在打太极.这里是过去的行为,而且是看到有人正在打太极,所以 see sb doing sth ,看到某人正在做某事.