17. We consider the machine should be adjusted each time it

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17. We consider the machine should be adjusted each time it is used.
A. that it necessary B. necessary it that C. it that necessary D. it necessary that
解析下!

原句应该是：
We consider__________ the machine should be adjusted each time it is used.

其中B、C句型错误,首先排除.

如果是A
we consider that 后面加从句,应该这样的
we consider that it is necessary that the instrument should be adjusted each time it is used.
因此that it necessary 不能成为从句.

另外,补充一下,consider it +adj.that （+从句）或 + to do sth 很比较常用的同位语句式
还有 think it adj.that / to do 等等

因此,选D.这个it是形式宾语,that所带才是真正地宾语.

再补充说明一下,（不针对任何人） it = the instrument should be adjusted each time it is used

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