21.It was not until he arrived in class _____ realized he had for_英语解答

21.It was not until he arrived in class _____ realized he had forgotten his book.

人气：117 ℃　时间：2020-06-25 02:27:29

解答

这个有问题,
我觉得是
It was not until he arrived in class did he realized that he had
forgotten his book.