Medical research has shown that the widespread use of cigarettes______(促进了癌症的增加)

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问题 Medical research has shown that the widespread use of cigarettes______(促进了癌症的增加)

选项

答案 contributes to the increase of cancers

解析 “促进”用contribute to表达,注意其主语是the widespreaduse of cigarettes,且主句的谓语是现在完成时has shown,故该处应使用谓语动词的第三人称单数形式contributes to。“癌症的增加”用the increase of cancers表达。
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