Mary to see you . She for you downstairs at the moment . A. has come ; is waitingB. cam

问题补充：

Mary to see you . She for you downstairs at the moment .

A. has come ; is waiting

B. came ; is waiting

C. has come ; waited

D. came ; was waiting

答案：

(答案→)A. has come ; is waiting

B. came ; is waiting

C. has come ; waited

D. came ; was waiting

解析：思考这道题时应该使用逆向思维，即先考虑第二个空白处的选项，再考虑第一空白处的答案。因为第二句中交代了一个重要的时间状语：at the moment (现在)，因此应毫不犹豫地选择is waiting这一现在进行时的时态。据此第一句的句意也就随之清晰起来?quot;玛丽已经到这儿来看望你很明显对表示对现在造成影响的动作要使用现在完成时态。