I don’t know if he us; if he , I’ll let you know.
A. will e and help; es
B. es and helps; will e
C. will e and help; will e
D. es and helps; es
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(答案→)A. will e and help; es
B. es and helps; will e
C. will e and help; will e
D. es and helps; es
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。