---The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?
--- my students have a try?
A. May
B. Must
C. Will
D. Shall
网友回答
A. May
B. Must
C. Will
(答案→)D. Shall
解析：此题考查情态动词shall的用法： Shall 用于第三人称，表示征求对方意见。句意：新的流感疫苗的研究有挑战性很难，你认为谁能做这个工作？--我的学生可以试一下吗？选D。