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
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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。