题目

 How happy we are! The holiday we have been looking forward ______ at last.    A. to have come     B. to has come    C. to having come     D. has come 答案：B如图中表示的是组合在一起的模块，在下列四个图形中，是这个模块的俯视图的是 [     ] A．B．C．D．