—Will you join us in the party this Saturday evening? —If I ____ ,I would ;but I will have...

—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

B


试题分析:考查虚拟语气:句意:--你将要参加周六晚上的派对吗?---如果我有空,我会的。但在那之前我将要前往日本经商了。but I will have left for Japan on business by then.可知有空的虚拟的,和将来相反的虚拟语气条件句用一般过去式或were to do,选B。
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