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--When _____ the abacus _____?   -- In the sixth century by the Chinese people.
A．is, inventedB．did, inventC．was, inventedD．does, invent
C

此題考查的是被動語態，由be+過去分詞。算盤是人發明的，它是動作的承受者。發明在過去，故用was invented,選C。
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