I think Kate will come if she free this afternoon.A. isB. will beC. wasD. are

问题补充：

I think Kate will come if she free this afternoon.

A. is

B. will be

C. was

D. are

答案：

(答案→)A. is

B. will be

C. was

D. are

解析：句意：今天下午如果她有空，我认为凯特回来。当主句描述将来动作时，英语条件状语从句中一般用一般现在时态表示将来动作，从句主语she是单数第三人称，结合语境可知选A。