---Why!Icouldn’tgetyouonthephonethismorning. ---We

问题详情：

 ---Why! I couldn’t get you on the phone this morning.

  ---We ____tennis in the yard when you phoned me.  

  A. could be playing  B. must be playing  C. must have been playing  D. should have played

【回答】

 C

知识点：虚拟语气与情态动词

题型：选择题