When I saw a strange riding on my bike,I ( )the police.A call B ask C called D asked 为什么
问题描述：
When I saw a strange riding on my bike,I ( )the police.A call B ask C called D asked 为什么
答
When I saw a stranger riding on my bike,I (C called) the police.
当我看到一个陌生人骑着我的自行车,我报了警.
call the police,报警.先排除B和D项.此外,句子是过去时态,因此用过去式,不选择原形call.