The computer was used in teaching. As a result, not only_________, but students became more interested in the lessons.

A．saved was teachers’ energy

B．teachers’ energy was saved

C．was teachers’ energy saved

D．was saved teachers’ energy

水泥混凝土配合比设计时，实际单位用水量最终是在（）阶段确定的。

A.基准配合比

B.初步配合比

C.试验室配合比

D.工地配合比