题干
—Where is Bob? I cannot find him anywhere.
—He have been off long. I heard him make a call just now.
A：shouldn't
B：can’t
C：mustn’t
D：needn’t
答案(点此获取答案解析）
B
A：shouldn't
B：can’t
C：mustn’t
D：needn’t
，顶点都在一个球面上，则该球的表面积为（ ）