It is required that every student _ a foreign language before goi_英语解答

It is required that every student _ a foreign language before going abroad.
A.learn
B.learns
C.will learn
D.should have learnt
为啥?

人气：371 ℃　时间：2020-02-05 15:29:09

解答

是虚拟语气
require的从句中用should do表示虚拟
should可以省略
所以用动词原形