Question

Do you think it necessary for teachers to make friends with students . ------I do . I think it is

Do you think it necessary for teachers to make friends with students . ------I do . I think it is a good idea .

A. Really B. Actually C. Usually
为什么选B请详解，谢谢

Answer 1

问:你是否认为老师有必要同学生做朋友.
答:实际上我认为有必要,好主意..
A 的really是回答是真是假的肯定答案,而问的是是否有必要,所以不对.
B 的actually表示真的,实际上的,选在这里表示师生交朋友的必要性.
C 的usually表示的是动作的频率,与本文无关.

Answer 2

Actually I do.这里的Actually 只是一种委婉的，客气的说法，去掉对意思没有妨碍。如 I actually do not want to go there.是委婉地推辞，去掉actualy也没关系。