题目

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   答案: 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”。  
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