---- Did you visit the Big Ben in London?

---- No, we ______ it, but we spent too much time shopping.

A．could visit

B．could have visited

C．must ahave visited it

D．can have visited

某黏性土样做不同围压的常规三轴压缩试验，试验结果摩尔包线前段弯曲，后段基本水平，这应是下列( )的试验结果。

A．饱和正常固结土的不固结不排水试验

B．未完全饱和土的不固结不排水试验

C．超固结饱和土的固结不排水试验

D．超固结土的固结排水试验