Theexpertshavemadeanotherbreakt

发布时间：2020-07-27 19:01:24

The experts have made another breakthrough in this field, ________ of great value to the progress of medical science．A.I think which isB.which I think isC.which I think it isD.what I think it is

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B解析I think是插入语，实际上which is 是定语从句的主谓结构，是非限制性定语从句。
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