Half a year ago mrs.Black ( ) into the river while she was doing some washing there.
A.sat B.fell C.took D.gave
答案：B
解析：fall into 落入,填入此处句意符合.A选项,无sit into 的说法,take into可用take sth into consideration,把.考虑在内,give into也一般不用,有give in“让步,屈服”之意.
句意：半年前,布莱克太太在河边洗衣服的时候掉进了河里.