单选题 It's reported that by the end of this month the output of cement in the factory ______ by about 10%.
A. will have risen B. has risen C. will be rising D. has been rising

【正确答案】 A
【答案解析】[解析] by the end of this month是表示将来的时间状语,意思为“截止到本月底”,可见谓语动词应该使用将来完成时,表示在将来某一时间之前完成的动作,B和C很显然不符合语法。由于谓语动词rise是短暂性动词,一般不用于进行时态,故D错误,正确答案为A,例如:I shall have left by the time you return.等你回来时,我可能已经走了。The railway will have been completed by the end of the month.那条铁路将于月底建成。