11.Tom looks exhausted. He ____ studying for the exam last night.
(A) had stayed up late
(B) would stay up late
(C) must stay up late
(D) must have stayed up late

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統計： A(1), B(1), C(1), D(2), E(0) #4066773

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#7623259
考題觀念 本題考的是情態助動詞＋完成式...
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