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
It is required that every student _ a foreign language before going abroad.
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?
A.learn
B.learns
C.will learn
D.should have learnt
为啥?
英语人气：990 ℃时间：2020-02-05 15:29:09
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