题目

Jane was disappointed that most of the guests______ when she_______at the party.   A. left; had arrived       B. left; arrived   C. had left; had arrived   D. had left; arrived 答案：D 解析: 客人在她arrived之前就已离开；过去的过去，用had left。 脱式计算．225-225÷15+90 8.5-（5.6+4.8）×0.2 35×[38÷（78-34）] 310÷[（34-12）÷79]