Question

请教一道英语题。It is necessary that he ____ the assignment without delay.

It is necessary that he ____ the assignment without delay. A. hand in B. hands in C. must hand in D. 答案选A，请问为什么？谢谢

Answer 1

因为It
is
necessary
that这个句型后面的从句中的位于部分，要求使用虚拟结构should
do,
而其中的should常常省略。