41. —Well, it's getting late. I must be going. Thank you again for inviting me to the party.

—________

A．Oh, it's already so late?

B．Thank you for coming.

C．Oh, sorry you could't come.

D．I really had a happy time.

伽利略的理想实验证明了（　　）

A．力不是维持物体运动的原因

B．要使物体运动必须有力作用，没有力作用物体就静止

C．要使物体由静止变为运动，必须受不为零的合外力作用，且力越大物体速度越大

D．物体不受力时，一定处于静止状态