7. It is hard to trace Steve's contributions in a linear fashion, because his work has
________ in so many directions.
(A) ratified
(B) rectified
(C) ramified
(D) rigidified
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統計: A(10), B(13), C(39), D(5), E(0) #1786982
統計: A(10), B(13), C(39), D(5), E(0) #1786982