题目

Whenever you are _____ , you can ask us for help. A. in ruins B. in reward C. in trouble D. in turn 答案：C 介词短语。in trouble “处于困境”, in reward“作为报答”, in turn “依次，轮流”如图，象棋盘上，若“将”位于点(1，－1)，“车”位于点(－3，－1)，则“马”位于点__________________．