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    精英家教网 > 高中英语 > 题目详情
      I don’t know if he ____ us; if he ____, I’ll let you know.
    A．will come and help; comesB．comes and helps; will come
    C．will come and help; will comeD．comes and helps; comes
    A
    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。
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