问题详情

Which of the following sentences is true of tile tasks which volunteers are required to do？
A．They learned to navigate a car and then searched for an object.
B．They learned how to navigate and then searched the town for an object.
C．They learned to predict when a sequence of dots would appear on a screen.
D．They learned to predict how a sequence of dots would appear on a screen.请帮忙给出正确答案和分析，谢谢！