15. If I ______ my lesson last weekend, I would have passed the exam.
(A) was reviewing
(B) had reviewed
(C) was reviewed
(D) had been reviewed
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統計: A(2), B(40), C(14), D(24), E(0) #2088230
統計: A(2), B(40), C(14), D(24), E(0) #2088230