Question

【题目】"The final exam is coming. You'd better concentrate ___________ your study. " Mother informed me __________ it.

A. to; of B. on; off

C. in; on D. on; of

Answer 1

【答案】D

【解析】句意：妈妈告诉我：“期末考试即将到来。你最好集中精力于你的学习。”concentrate on集中于，专心于;inform sb.of sth.告知某人某事。