27. Mr. Jackson will not be able to finish the proposal _______ he can gather the data in two days.
(A) when
(B) or
(C) either
(D)unless
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統計: A(8), B(3), C(5), D(127), E(0) #1782240
統計: A(8), B(3), C(5), D(127), E(0) #1782240