--- Don’t do that again. Don’t you think it _______?

--- It maybe _______ to be successful.

A．a waste of time; turns

B．wastes of time; turns in

C．waste of time; turns up

D．a waste of time; turns out

从经济角度考虑，该分包商是否应该采取赶工措施，说明理由。假设分包商需赶工，应采取哪一种赶工方式