What you at 10:00 last night?A. did; doB. were; doingC. was ;doingD. have; done

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A. did; do
(答案→)B. were; doing
C. was ;doing
D. have; done
解析：根据last night可知，本句的时态是过去时，所以排除D；又因为10点，所以本句应该是过去进行时，应该选BC；根据you，我们知道应该用were。所以本题选B。