语法与词汇 28.AWhile experts in basic science are important, Bskilled talents should be the Coverriding majority since they are Dat heavy demand in the market
【正确答案】 D
【答案解析】D改为in heavy demand。本题考查的是习惯用语(be)in demand,意思是“需要”,而不是用at demand来表示。