18. The greatest classes are the ones ____ teachers and students have a loving relationship.
(A) in which
(B) in where
(C) in that
(D) in them
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統計: A(463), B(33), C(44), D(1), E(0) #2429977
統計: A(463), B(33), C(44), D(1), E(0) #2429977