Alex changed his mind at the last minute，otherwise we ________ an agreement.
A．should have reachedB．could have reached
C．can reachD．should reach
B

句意為：亞歷克斯最終改變了主意，否則的話我們就會達(dá)成一致了。對過去事情的推測，應(yīng)該使用“情態(tài)動詞＋have done”。should have done應(yīng)該已經(jīng)做了……；could have done很可能已經(jīng)做了……。所以應(yīng)該選擇B項。
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