Aonther two months will be needed before the new bridge ____.DAonther two months will be needed before the new bridge ____.A.completesB.is completedC.has completed D.will be completed为什么是主将从现

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Aonther two months will be needed before the new bridge ____.DAonther two months will be needed before the new bridge ____.A.completesB.is completedC.has completed D.will be completed为什么是主将从现
Aonther two months will be needed before the new bridge ____.D
Aonther two months will be needed before the new bridge ____.A.completes
B.is completed
C.has completed
D.will be completed
为什么是主将从现

Aonther two months will be needed before the new bridge ____.DAonther two months will be needed before the new bridge ____.A.completesB.is completedC.has completed D.will be completed为什么是主将从现
B因为桥是被建完用被动,before 引导时间状语从句,用一般现在是表示将来