Question

---When shall we start the restoration of the historic buildings?

---When shall we start the restoration of the historic buildings?
一Not until our plan________ by the committee.
A. will be approved B. approves
C. is to approve D. has been approved
详细讲解

Answer 1

d
问句里的shall表明“开始修复”（start the restoration） 是将来时。 答句里表明只有计划被通过才能开始修复，因此“计划被通过”发生在“开始修复”之前。既然“开始修复”是将来时，“计划被通过”又要在这之前完成，所以只能是现在完成时has。

Answer 2

Not until 放在句首时主句应当到装，所以选择D。

Answer 3

D

Answer 4

c

Answer 5

D