I wonder you were doing last night.A. it was what thatB. what was it thatC. that what it

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A. it was what that
B. what was it that
C. that what it was
(答案→)D. what it was that
解析：本题强调特殊疑问词。宾语从句用陈述句语序。其中特殊疑问词在句中做宾语从句的宾语。