.

．She asked Mary_________her homework.

A．if she had finished

B．that whether she had finished

C．that if she has finished

D．whether she has finished

在学生的学习活动中居支配地位，发挥主导性作用的动机是（）。

A.主导性动机

B.交往性动机

C.威信性动机

D.辅助性动机