how happy i was to hear that!为什么hear用原型,这是什么时态?

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how happy i was to hear that!为什么hear用原型,这是什么时态?

how happy i was to hear that!为什么hear用原型,这是什么时态?
how happy i was to hear that!为什么hear用原型,这是什么时态?

how happy i was to hear that!为什么hear用原型,这是什么时态?
i was so happy to hear it,的倒装.是过去时

be to do sth.

To后面跟动词原型。

to+动词原形。