问题补充：
John agreed to the suggestion that his students two weeks to prepare for the exam.
A. give
B. should give
C. be given
D. must be given
答案：
A. give
B. should give
(答案→)C. be given
D. must be given
解析：考查虚拟语气。句意：约翰同意这个建议，给学生两周的时间准备考试。Suggestion，advice，order，demand，request，requirement等做先行词，后面出现同位语从句时，从句用should + v结构，should可以省略。如：The order that the soldiers get together at midnight must be obeyed这道命令，战士们在午夜集合，必须被遵守。故选C。
