There         a class meeting tomorrow afternoon.

A．is going to have

B．will be

C．will have

D．will be going to be

20减去3.1的差的6倍，再除以0.7，商是多少?正确的列式是[ ]

A. 20-3.1×6×0.7        

B. (20-31) ×6÷0.7        

C. (20-3.1×6)÷0.7