We didn't notice him___(leave) when we read the books.

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We didn't notice him___(leave) when we read the books.
We didn't notice him___(leave) when we read the books.

We didn't notice him___(leave) when we read the books.
我认为是leaving,notice 同 watch,see的用法,其后可以接do或者 doing这里when we read the books.应该是个时间点,所以我认为应该是leaving

We didn't notice him_leave__(leave) when we read the books.
did/didn't后面加动词原形