I am not sure if Tom ____ home.If he ___,I will call you.

问题描述:

I am not sure if Tom ____ home.If he ___,I will call you.
A will come,will come B comes,will comeC will come,comes

选C
前面是if引导的宾语从句,后为If引导的条件句,故用一般现在时表将来.
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