单选题 Mr. Brown had us ______ reports all afternoon.
A. write B. written C. to write D. to be writing

【正确答案】 A

【答案解析】[解析] have为使役动词，后接复合宾语，其中宾语补足语可以是不带to的不定式、现在分词或过去分词。不定式作宾补时，和宾语具有逻辑上的主谓关系，例如：The children were surprised when the teacher had them close their books unexpectedly．老师突然让他们把书都合上，孩子们感到很惊奇。可见只有A最合题意。