Only when he was put in prison，（）how silly.

The （）was proposed by several linguists.

A.politeness principle
B.feature of indeterminacy
C.information presented
D.non-detachability

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Care must be taken not to wash or iron synthetic fibers at（）.

A.a too high temperature
B.too a high temperature
C.too high a temperature
D.a temperature too high

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