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单选题
56.We required that the machine partscast iron.
A
A. is made of
B
B. should make by
C
C. is made by
D
D. be made of
答案解析
正确答案：D
解析：
56.【翻译】我们要求机器部件用铸铁制成:.【精析】【）当require, suggest, order, advise等表示建议、命令、要求等含义的动词后接宾语从句时，从句要用虚拟 语气，即从句谓语动词应用，l should +动词原形”的形式,should可以省略，所以可排除选项A、C。根据句意可知，“机 器部件”和“制作”之间是逻辑上的动宾关系，所以应用被动语态，所以可排除选项B。故选D。
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