问题补充:
——Helen, do you know if Martin to my party next week?
——I think he will come if he free.
A. will come; will be
B. will come; is
C. come; is
D. comes; will be
答案:
A. will come; will be
(答案→)B. will come; is
C. come; is
D. comes; will be
解析:句意:海伦,你知道马丁下周是否来参加我的聚会吗?——如果他有空,我想他回来的。结合语境可知上文是宾语从句,描述的是将来发生的动作,故用一般将来时态。下文是条件状语从句,当主句描述将来动作时,从句中用一般现在时态表示将来的动作。故选B。