31. If we ___________ more aware of the trends, we could have avoided such a great loss.
(A) are
(B) were
(C) have been
(D) had been

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統計： A(0), B(4), C(0), D(2), E(0) #4063889

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#7593109
考試重點 本題測驗假設語氣（Subjun...
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