If you have any difficulty with this paper you can your notebooks.A. focus onB. carry on

问题补充：

If you have any difficulty with this paper, you can your notebooks.

A. focus on

B. carry on

C. refer to

D. go with

答案：

A. focus on

B. carry on

(答案→)C. refer to

D. go with

解析：考查词组：A. focus on专注于B. carry on继续C. refer to参考，查阅D. go with和…匹配，句意：如果你写试卷有困难，可以参考笔记。选C。