The doctor ---she sent her friend is very famous.

The doctor ___she sent her friend is very famous.选项:a、to whomb、to whosec、whomd、at whom--------------------------------------------------------------------------------题号:22 题型:单选题（请在以下几个选项中选择唯一正确答案） 本题分数:3.33内容:Abraham Lincoln (亚伯拉罕.林肯) was the____of the United States.选项:a、the sixteenth presidentb、the sixteen presidentc、president sixteend、president the sixteenth