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

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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