Green tea, many experts suggest, should be drunk regularly to improve health.A. whichB. wh

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A. which
B. where
C. when
(答案→)D. as
解析： 考查定语从句，先行词为Green tea，从句中suggest后缺少宾语，故用关系代词，可排除B和C，再根据语意设空的句子意思为正如专家建议的那样，所以选D。