--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(dòng)語(yǔ)態(tài)，由be+過(guò)去分詞。算盤(pán)是人發(fā)明的，它是動(dòng)作的承受者。發(fā)明在過(guò)去，故用was invented,選C。
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