—Tom do you know if Sam to my party next week?—I think she will come if she free.A. comes

问题补充：

—Tom, do you know if Sam to my party next week?

—I think she will come if she free.

A. comes;will be

B. will come;is

C. comes;is

D. will come;will be

答案：

A. comes;will be

(答案→)B. will come;is

C. comes;is

D. will come;will be

解析：句意：汤姆，你知道下周萨姆是否回来参加我的聚会吗？——如果她有空，我认为她会来的。结合语境可知上文为宾语从句，从句中描述的是将来的动作，故用一般将来时态。下文是条件状语从句，主句描述将来动作时，条件状语从句中用一般现在时态表示将来动作，故选B。