摘要：9．-When the abacus ?-In the sixth century by the Chinese people． A．is.invented B．did.invent C．was.invented D．does.invent
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--When _____ the abacus _____? -- In the sixth century by the Chinese people.
| A．is, invented | B．did, invent | C．was, invented | D．does, invent |
--When _____ the abacus _____? -- In the sixth century by the Chinese people.
|
A．is, invented |
B．did, invent |
C．was, invented |
D．does, invent |
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