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

Question

英语选择题，英语爱好者帮忙啊

Answer 1

是强调句型，不过你的句子写错了。应该是：It was not until he arrived in class that he realized he had forgotten his book.

Answer 2

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.本回答被提问者采纳

Answer 3

这句话可以说成
not until he arrived in class did he realized ....
如果要是强调句 即去掉it is 和and 句子意思仍然完整
故为 it was not until he arrived in clss that he realized.....

Answer 4

that强调句啊！！

Answer 5

that he