—Jim could you tell me if you our party tomorrow?—I think I will if I free. A. will tak

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。