题目

如何判断是of itself 还是 by itself?
40.When I was about to go out,the door opened ___.
A.of itself B.by itself
C.oneself D.for itself

提问时间：2021-03-28

答案

of itself 是自动的,自然而然的意思
by itself 是独自的,单独一个人的,要用在至少有生命力的东西才能用by itself.
所以这题选A