This is the best film (that I have ever seen)
The book (is important to) meWe're afraid of the teachers --------- strict with students.A.that is B.which areC.who is .D.that are麻烦了...D 先行词为人时，可用who,that,whom此处做主语可用who和that，teachers为复数所以从句用复数are,所以选D