16.It is considered common knowledge that rocks are stationary objects that have stayed put for thousands of years.
(A)It is commonly known that rocks are things staying unmoved at the same place for ages.
(B)It is well known that stationery which is made with stones can stay and last for a very long time.
(C)As we have studied rocks for so many years, knowledge of rocks is considered to be ordinary and general.
(D)It is shocking to find that so many big stones have been piled up in the area for thousands of years.
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