We consider______the instrument should be adjusted each time it is used.

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问题 We consider______the instrument should be adjusted each time it is used.

选项 A、that it necessary
B、necessary that
C、it necessary that
D、necessary of it that

答案C

解析 如果宾语从句后跟有补语,常用it作形式宾语,而将从句放到补语之后。
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