问题补充：
--- I want to know if she in my birthday party tonight.
--- I believe if she her homework, she will join us.
A. will join; will finish
B. will join; finishes
C. joins; finishes
D. joins; will finish
答案：
A. will join; will finish
(答案→)B. will join; finishes
C. joins; finishes
D. joins; will finish
解析：考查时态。句意：---我想知道是否她今晚将会来参加我的生日派对？----我相信如果她完成作业的话，她将会加入到我们中来。第一个if引导一般疑问句作宾语从句，第二个if是引导的条件状语从句，故选B。
