（）she seemed to find English very difficult, but later he made very good progress.

A.At the first

B.At present

C.At the present

D.At first

计算分析车站运输指标时，合资铁路分界站对合资铁路接入到达本站卸车的重车，按（）计算。

A.装车数

B.使用车

C.增加使用车

D.非运用车