16. All of us wonder why they are so late as they ______ here early this morning.
(A) might be
(B) must have been
(C) needn't be
(D) should have been

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統計： A(8), B(15), C(10), D(65), E(0) #628475

詳解 (共 1 筆)

#1055881
選(D)，與過去事實相反，關鍵字this morning
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