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When this kind of computer ?A.is; usedB.was; usedC.did; useD.are; used

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When this kind of computer ?A.is; usedB.was; usedC.did; useD.are; used

When______this kind of computer _______?

A.is; usedB.was; usedC.did; useD.are; used

试题答案

B

解析