2. 专升本
  3. It is recommended that the screw ______ to increase accuracy of measurement.

It is recommended that the screw ______ to increase accuracy of measurement.

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问题 It is recommended that the screw ______ to increase accuracy of measurement.
选项 A、is used
B、was used
C、be used
D、had been used
答案C
解析 It is recommended后的主语从句必须使用虚拟语气，其表现形式为“should+动词原形 (should可省略)”，由此可见答案应为C。类似用法的还有it is desired(suggested，ordered， proposed，necessary，important，decided等)。
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