It is suggested that more modern science and technology ____ textbooks

It is suggested that more modern science and technology ____ textbooks

题目
It is suggested that more modern science and technology ____ textbooks
a.added to b.be added to c.is added to d.are added to
选B 怎么判断和分析
答案
这里suggest做建议的意思,所以要用虚拟语气,所以是suggest...(should) do
,should可以省略,所以是B
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