—Dad,shallwegototheWorldParktomorrow?—Sorry.Iwon’tbefre...

问题详情：

—Dad, shall we go to the World Park tomorrow?

—Sorry. I won’t be free, but you ______ ask Mum to go with you.

A. must    B. may           C would                    D. should

【回答】

B

知识点：情态动词

题型：选择题