---The research on the new flu virus vaccine is challenging and demanding. Who do you thin

问题补充：

---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

答案：

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。