it ____heavily the outing had to be put off.为什么答案不能是being raining?正确答案是,raining.

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it ____heavily the outing had to be put off.为什么答案不能是being raining?正确答案是,raining.
it ____heavily the outing had to be put off.
为什么答案不能是being raining?正确答案是,raining.

it ____heavily the outing had to be put off.为什么答案不能是being raining?正确答案是,raining.
being 后都是过去式词,因为被动词作用.
例子:
The job is being completed.
She is being bullied.