【答案】There is a bridge ____ the river. Be careful when you ____ it. ( )

There is a bridge ____ the river. Be careful when you ____ it. ( )

A. across; over B. over; cross

C. over; across D. cross; over

【答案】

B

【解析】

主语为a bridge, 系动词为is，此处缺少介词; on，在…上面(与物体有接触); above在…正上方(与物体没有表面接触); over，在…上面(与物体没有表面接触); across，prep. 穿过、横穿;across… from…在…对面; cross, v. 穿过、横渡;when you cross it, 由when引导了时间状语，“当你过去的时候”; 翻译：河上有一座桥.当你过去的时候要小心一点.