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

問題詳情：

 ---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

知識點：虛擬語氣與情態動詞

題型：選擇題