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hesaidwasnotwithinhispowertoanswerthequestionA、thatB、thisC、suchD、it为什么?

题目详情
he said _ was not within his power to answer the question A、that B、 this C、such D、it 为什么?
▼优质解答
答案和解析
D
it作形式主语,真正的主语是to answer the question