语法与词汇
The students had a lot of trouble (concentrating) on their study because of the noise from the construction outside.
【正确答案】
A
【答案解析】concentrate on“集中注意力，专心，注意”；focus用于引申意义时，与concentrate意思大致相同。carry out“贯彻，执行”；continue with“继续…”；pay for“花钱买…”。本题译文：由于外边建筑工地上噪音很大，学生们很难集中注意力学习。