题目

The ______ look on his face suggested that he ______ that he would fail in the Maths test．        A．surprising; wouldn’t expect    B．surprising; hadn’t expected        C．surprised; hadn’t expected      D．surprised; shouldn’t expect 答案：C 解析: 略物体发形变会产生力的作用，这种力叫 ，它是物体由于 而产生的．