下列计算错误的是[ ]

A.（-2x）³=-2x³

B.-a²·a=-a³

C.（-x）⁹÷（-x）³=x⁶

D.（-2a³）²=4a⁶

— Could you tell me _____ to see me next week?

— I'm not sure. If I'm free, I will. [ ]

A. if you will come

B. how you will come

C. whether you would come