一楼在胡说
这根本不是强调句,而是主语从句,it是形式主语,that从句是真正的主语.
此题选A,原因在于required这个词.
require是要求的意思,含有这种“要求,命令,建议”含义的词,后面的从句要用虚拟语气,形式是 should + 动词原形,其中的should可以省略.
A项就是省略了should
注意,只能是should,不能是别的情态动词.
语法规定的.
我有绝对把握.相信我.
It is required in some colleges that lights in students'dorm
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