问题补充:
—Jim, could you tell me if you our party tomorrow?
—I think I will if I free.
A. will take part in, will be
B. take part in, am
C. will take part in, am
D. would take part in, will be
答案:
A. will take part in, will be
B. take part in, am
(答案→)C. will take part in, am
D. would take part in, will be
解析:句意:吉姆,你能告诉我你明天是否参加我们的聚会吗?我想如果我有空,我将参加。在第一句中if引导宾语从句,在第二句中if引导条件状语从句。所以选C。