第23题: [单项选择]The project to clear up the polluted river _______by the end of next year. A. will have been completed B. will have completed C. is being completed D. has been completed 参考答案:A 答案解析:该题有两个考点:1、考查将来完成时态。句中有by the end of next year 这个标志性介词短语,表明该句是到那个时候已经完成的事情。2、考查被动语态。Complete的主语是the r