【题目】The students have decided on a final date by which everyone reading the books assigned by their professor.
A. finishesB. finished
C. have finishedD. will have finished
在线课程【答案】D
【解析】
考查时态。句意：学生们决定了最后的日期，到那时每个人都将读完教授布置的书。根据“a final date by which”可知此处表示将来已经完成的动作，应该用将来完成时，故D项正确。