Only after they had discussed the matter for several hours ______ an agreement.
A．they reachedB．do they reach
C．they reachD．did they reach
D

試題分析：考查倒裝句。當only放在句首，且強調(diào)的是狀語的時候，后面的主句使用部分倒裝的形式。本題only放在句首，強調(diào)的是時間狀語after they had discussed the matter for several hours,故后面使用部分倒裝的形式，因為時態(tài)had discussed說明這里使用一般過去時。句意：只有當他們討論了幾個小時以后，他們才達成了一致的意見。故D正確。
點評：當only放在句首，且強調(diào)的是狀語的時候，后面的主句使用部分倒裝的形式。
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