— Where is Tom's and Peter's homework?

— The two students ______ ill yesterday, and they didn't come to school.[ ]

A. were all

B. all were

C. both were

D. were both

广义相对论认为，空间一时间本质上是物质客体的广延性和持续性，它本身不是独立存在的。这一思想由于其革命性和数学形式上的深奥性，在一段时间里不为科学界所接受。但由于得到越来越多的实验证实，今天广义相对论已被公认为研究大尺度时空的理论基础。这些实验不包括( )。

A．水星近日点的进动
B．光谱引力红移
C．光线在引力场中偏转
D．大爆炸宇宙模型