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

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統計： A(26), B(12), C(13), D(468), E(0) #3002455

詳解 (共 1 筆)

#6634364
Before I cleaned the...
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