3 While watching television,____.3 While watching television,____.0 - 解决时间：2006-6-1 1
问题描述：
3 While watching television,____.3 While watching television,____.0 - 解决时间：2006-6-1 1
3 While watching television,____.
Athe door rang Bthe door rings Cwe heard the doorbell ring Dwe heard the doorbell rings 为什么不选B
答
选C.前面半句是现在分词作时间状语,相当于while we were watching TV,其动作的发出者必须和句子的主语相一致,故不能选A、B（门铃是不会看电视的）.不选D是因为hear sth do的结构.