单选题 24.  Your request ______ your lease has been declined as the letter was postmarked March 4, which clearly falls outside the 30-day grace period stated on your contract.
【正确答案】 C
【答案解析】 选项A错误，request后面不能跟动词原形。选项B错误，cancellation是名词，但空白处应填某个行为。选项C正确，不定式to cancel表示“取消”。选项D错误，request不能接“for+动词”的形式。