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It is that they have been working there since 1930.A.known to allB.known by us a

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It is that they have been working there since 1930.A.known to allB.known by us a

It is ________ that they have been working there since 1930.

A.known to all

B.known by us all

C.well-known

D.known to us all

试题答案

D