—Lily went to see the movie alone.

—If she _____ me about it, I would have gone with her.

A．should tell

B．tells

C．told

D．had told

一个工人用如图所示滑轮组提起2000N的货物，滑轮组的效率为80%，当绳子自由端被拉下4m时，这个工人做功_______J，所用拉力为_________N。