He hid himself behind the door he still could see what would happen to his classmates.
A. there
B. which
C. from which
D. from where
网友回答
A. there
B. which
C. from which
(答案→)D. from where
解析：易错选C, from where相当于 from behind the door,而from which则相当于from the door,显然from where更合乎语境.