题目

 The chairman requested that ＿＿＿＿＿＿＿＿＿＿＿. A. the members studied the problem more carefully B. the problems were more carefully studied C. the problems could be studied with more care D. the members study the problem more carefully 答案：D 解析: 在suggest, demand, request，require(要求)，order(命令),insist（坚持），advise（劝告）等动词之后的宾语从句中，谓语动词要用(should) do，同时还应注意语态。

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