The teacher asked his students to do the homework____.

问题描述:

The teacher asked his students to do the homework____.
选项是:A by themself B by them C in person D in persons
选哪个

选A
老师要求他的学生们自己完成家庭作业可是A选项不应该是themselves才是对的吗?我想知道的是选C还是选D嗯。选C
这个是词组in person 亲自。不需要s
没注意A少了复数形式对不起了。