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From 1800 to 1968 Admiralty charts were published with fathoms and feet as the units for depths，and feet as the units for height．Since 1968 Admiralty charts ________ to meters，thus conforming with charts of most other countries．
A.gradually converted
B.have been gradually converted
C.has been gradually converted
D.is gradually converted
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更多 “ From 1800 to 1968 Admiralty charts were published with fathoms and feet as the units for depths，and feet as the units for height．Since 1968 Admiralty charts ________ to meters，thus conforming with charts of most other countries．A.gradually convertedB.have been gradually convertedC.has been gradually convertedD.is gradually converted ” 相关考题
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