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14.Whattheyneedatpresent(be)scienceandtechnology.怎么填,为什么?

题目详情
14.What they need at present ____ (be) science and technology.
怎么填,为什么?
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答案和解析
What (they need) at present is (be) 【science and technology】.
What才是真正的主语,后面方框内为宾语.