12. I’m afraid you’ve missed the deadline. The paper _____ in by yesterday.
(A) should have been turned
(B) must have turned
(C) should be turned
(D) must be turned

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統計： A(1), B(1), C(2), D(0), E(0) #3992766

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#7470806
與過去事實相反的假設語氣 12. ...
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