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问几道英语的题A c------- of facts may be responsible for the increa

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问几道英语的题
A c------- of facts may be responsible for the increase in cancer(首字母填空)
You must have your luggage -------(weigh)at the airport (单词正确形式)
---------the population of China ----------(control) in the past five years (同上)
问几道英语的题A c------- of facts may be responsible for the increa
保证答案准确!1.combination 结合/混合2.weighedhave是使役动词,意思是“让”,宾语your luggage,而宾语补足语采用weigh的过去分词weighed.因为宾语your luggage和宾补动词weigh之间为被动关系.即have sth done意思是...