14.What they need at present ____ (be) science and technology.怎么填,为什么?

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14.What they need at present ____ (be) science and technology.怎么填,为什么?
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14.What they need at present ____ (be) science and technology.怎么填,为什么?
14.What they need at present ____ (be) science and technology.
怎么填,为什么?

14.What they need at present ____ (be) science and technology.怎么填,为什么?
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.

What they need at present (is) science and technology.

is!
因为 be 是 is 的母词。

what引导的名词性从句,做单数理解,所以后面的be型要用is

is

is.what 做主语时,动词用单数形式,主谓一致原则.