—WillyoujoinusinthepartythisSaturdayevening?   —IfI

問題詳情：

—Will you join us in the party this Saturday evening? 

   —If I ____ ,I would ;but I will have left for Japan on business by then．

A．am free          B．were to be free      C．will be free         D．would be free

【回答】

B

知識點：虛擬語氣

題型：選擇題