16.Before I cleaned them up, the pile of books ____ at the stairway for days.
(A) had been
(B) been
(C) am
(D) will be

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統計: A(2), B(0), C(0), D(3), E(0) #4066778

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#7623250
這題在考什麼觀念 過去完成式(past...
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