C
第一个IF "是否‘ 引导的是宾语从句,动作还没发生,故用一般将来时.
第二个IF ’ 如果‘ 引导的是状语从句,遵循‘ 主将从现’ 原则,主语是HE三单,故要用is
加油!不明白再问!
-Do you know if he( )to play football with us?
3个回答
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