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问题: 虚拟语气问题: Thakla’s visit to England made it necessary that her sister ______ more in the house.

Thakla’s visit to England made it necessary that her sister ______ more in the house.
A would do B do
请问这里为什么用would do, 而不用do.

解答:

这不是虚拟语气,使过去将来时,所以用would do.