Question

Mr Li required the computer equipment referred ________ used in every classroom.

A. should be                                                B. have to be              

C. to be                                                       D. to being

Answer 1

C

解析:

因为在表示“要求”的require, request, ask, demand等动词后的宾语从句的谓语要用“(should+)动词原形”，句中referred to是过去分词短语，作the computer equipment的定语，所以选C。