7、 This might seem like a rather _____ topic that has no relevance to students, yet after some further discussion and explanation, students got to make it out.
(A) molten
(B) robust
(C) lucrative
(D) abstruse
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統計: A(3), B(6), C(13), D(64), E(0) #1293292
統計: A(3), B(6), C(13), D(64), E(0) #1293292