Scientists involving in a serious debate about how to solve the problem of global warming.

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问题 Scientists involving in a serious debate about how to solve the problem of global warming.

选项 A、were to involve in
B、involved in
C、were involved in
D、were to be involved in

答案C

解析画线部分使用了动词现在分词结构，使句子缺少谓语，故错误。sb. be involved in doing为固定搭配，此处意为“某人参与／涉及某事”，故选择C项。A项to do表示事情还没发生且involve没有宾语，排除；B项没有be动词，排除；D项也表事情还没发生，排除。

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