14. The conference could have been successful if the keynote speaker ____ late for 40 minutes.
(A) hadn't been
(B) haven't been
(C) hasn't been
(D) would be

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統計： A(1), B(0), C(0), D(0), E(0) #3373160

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#6813444
當然可以，以下是針對考試題目「The c...
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