there is a new problem __ in the popularity of private cars __ road conditions need to be improved.为什么第一空要填involved?

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• 一道选择there is a new problem involved in the popularity of private cars ____road conditions need ___.A.that;to be improvedB.which;to be improvedC.where;improvingD.when;improving第二个空为什么填to be improved?need之后不是用动名词表示被动含义吗?
• 4.There is a new problem involved in the popularity of private cars ___road conditions need -A.that; to be improvedB.which; to be improvedC.where; improvingD.when; improving第一个空如何辨别是同位语,而不是地点状语
• there is a new problem __ in the popularity of private cars __ road conditions need to be improved.为什么第一空要填involved?
• 4.There is a new problem involved in the popularity of private cars road conditions need ---------.A.that; to be improvedB.which; to be improvedC.where; improvingD.when; improving
• There is a new problem involved in the popularity of private cars ___road conditions need _____.第一个空填where不行吗?
• There is a new problem ---- in the popularity of private cars ----road conditions need to be improvA.involving;that B.involved;that C.involved;where D.involving;which选B为什么,A怎么不行
• There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用第二格为什么填to be improved 不填improving
• There is a new problem involved in the popularity of private cars that road conditions need to be improved.这句话能分析并翻译下吗?
• 4.There is a new problem involved in the popularity of private cars ___road conditions need -
• There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用
• 如图,用一块边长是18厘米的正方形硬纸片,在四个角上截去4个相同的小正方形,然后把四边折合起来,做成一个没有盖的长方形纸盒.请你算一下,截去的4个相同的小正方形的边长是多少厘米时,长方体纸盒容积最大?最大容积是多少?
• 将一块边长为a厘米的正方形铁皮,在四个角截去同样的小正方形,然后把四边折起来,做