第18题: [单项选择]The students______ their papers by the end of this month. A. will have finished B. have been finished C. have finished D. will finish 参考答案:A 答案解析:[考点] 时态
[解析] 本题解答的关键在于句末的by the end of this month, “by”一般用于完成时态,所以可以得出,这个句子考查的是将来完成时的用法,即will have