It is required that such insulator (绝热体) ______ a heat resistant material.A、must

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问题 It is required that such insulator (绝热体) ______ a heat resistant material.

选项 A、must be made of
B、should be made of
C、will be made of
D、would be made of

答案 B

解析在“it is required that…”句型中that从句中要用虚拟语气，其表示方法是should do。类似的还有“it is desired that…”，“it is suggested that…”，“it is ordered that…”等。

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