--- Betty, could you answer my question?

--- Sorry, Mr. Green. I didn’t hear you. I _______ about something else.

A．was thinking

B．am thinking

C．think

D．thought

在三轴试验中，比较三种排水条件下的内摩擦角的大小，正确的是（）。

A.φ_d＞φ_u＞φ_cu

B.φ_d＞φ_cu＞φ_u

C.φ_cu＞φ_u＞φ_d

D.φ_cu＞φ_d＞φ_u