He is a man who is active in social activities, and he _______ do public service work now and then.
A. is about to B. is going to
C. is willing to D. will
He is a man who is active in social activities, and he _______ do public service work now and then.
A. is about to B. is going to
C. is willing to D. will
C
A、B、D都表示将来，这里应用一般现在时，所以选择C项。be willing to do something 意思是“乐意做某事”。