They _______ England and they will be back next week. [ ]

A. have gone to

B. have been to

C. have gone in

D. has been on

下列几种现浇结构外观质量缺陷属于严重缺陷的是（）。

A、连接部位有基本不影响结构传力性能的缺陷

B、纵向受力钢筋有露筋

C、构件主要受力部位有蜂窝

D、构件主要受力部位有夹渣