单选题 Because of the unexpected changes, they postponed ______ us an answer.
A. giving B. have given
C. to give D. to have given

【正确答案】 A

【答案解析】[解析] postpone意为“延缓，耽搁”，后接动名词作宾语，例如：The company postponed sending an answer to the request. 该公司没有及时答复这一请求。由此可见A项是正确答案。