语法与词汇 8.I'm tired out. I______all afternoon and I don't seem to have finished anything.
【正确答案】 D
【答案解析】句意：我累坏了，逛了一个下午仍一无所获。由I am tired out可知说话人说的是现在的事情，所以排除A和C。由句意可知动作的影响还在持续，所以应该用现在完成进行时，故答案选D。