– I don’t know if Mr. Li to the party this evening.-- I think he will come if he free.A.

问题补充：

– I don’t know if Mr. Li to the party this evening.

-- I think he will come if he free.

A. will come; is

B. will come; will be

C. comes; is

D. comes; will be

答案：

(答案→)A. will come; is

B. will come; will be

C. comes; is

D. comes; will be

解析：从句时态的考察 本题考察if引导的从句时态的考察，第一个if引导的是宾语从句，“李老师今晚是不是将参加我们的聚会”应用一般将来时；第二个if引导的是条件状语从句应“主将从现”。