男性，43岁，膀胱内的 * * 状瘤，就诊时医生告诉病人，应尽早手术，因为易发生（）
A.出血
B.结石
C.感染
D.尿潴留
E.恶变
参考答案：E
已知代数式x+2y的值是3，则代数式2x+4y+1的值是 [ ]
A．1
B．4
C．7
D．9
— I haven't finished my task yet.
— You shouldn't have watched the film last night, or you ____ it by now. [ ]
A. need have finished
B. may have finished
C. should have finished
D. will have finished
