A.write; writingB.write; wroteC.writing; wroteD.writing; writes

【答案】C

【解析】

句意：南希擅长写作。她上周写了一个故事。be good at doing sth.擅长做某事，write的动名词是writing。根据last week可知第二个句子是一般过去时，谓语动词要用过去式，write的过去式是wrote。故选C。