一When shall we start the restoration of the historic buildings?一Not until our plan by the

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A. will be approved
B. approves
C. is to approve
(答案→)D. has been approved
解析：这题考查时态语态，our plan和approve是被动关系，用被动，选择A或D。A项是一般将来时，not until引导的是时间状语从句，不能用将来时，可以用一般现在时或现在完成时，选D。