“Gototheplaygroundandhavefun,”parentsoftensaytotheirki...

问题详情：

 “Go to the playground and have fun,” parents often say to their kids. But they ought to remember playgrounds ________ be dangerous.

       A. shall                        B. can                         C. will                          D. should

【回答】

B

知识点：情态动词

题型：选择题