We asked six students what yesterday.A. do they doB. did they doC. they didD. they do

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A. do they do
B. did they do
(答案→)C. they did
D. they do
解析：此题重点考查宾语从句的时态和语序问题，无论哪种句式结构充当宾语从句都要用陈述句语序，从句的时态要和主句的时态保持一致。因主句的谓语动词是过去式从句的谓语动词也要用相应的过去时态。