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

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

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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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