I don’t know if he us; if he I’ll let you know.A. will come and help; comesB. comes and

问题补充：

I don’t know if he us; if he , I’ll let you know.

A. will come and help; comes

B. comes and helps; will come

C. will come and help; will come

D. comes and helps; comes

答案：

(答案→)A. will come and help; comes

B. comes and helps; will come

C. will come and help; will come

D. comes and helps; comes

解析：第一个if的意思“是否”，引导宾语从句，根据句意应该用将来时态。第二个if的意思“如果”，引导条件状语从句，从句用一般现在时态代替将来时态，所以答案A。