The patient complained ______ a terrible pain in his chest.

　　[A]: about

　　[B]: with

　　[C]: of

　　[D]: at

　　【世博精解】：如“complain”的意思是说“有什么疼痛不适时”根“of”引起的介词短语。“complain about”是“抱怨、埋怨、诉苦”的意思。

　　Key to exercise: C