As the holidays approach, many people are finishing their travel plans. And they have【C1】______themselves for the usual crowds,

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问题     As the holidays approach, many people are finishing their travel plans. And they have【C1】______themselves for the usual crowds, long security lines and inevitable delays.
    This period, planes will be even more tightly【C2】______as airlines continue to cut capacity(容量) 【C3】______the end of the year and into the next,【C4】______as more passengers take to the skies. But【C5】______crowds aren’t the only differences that holiday travelers can expect this year. Some changes,【C6】______improved security screenings for children, will be welcome,【C7】______won’t. Below, some of the most notable changes that have been【C8】______over the last 12 months, as well as a few new【C9】______to help avoid long lines and some【C10】______such as luggage fees.
    The big news for this holiday【C11】______is that children aged 12 and under can leave their shoes on【C12】______going through security. The policy change, which【C13】______as part of a test in August by the Tra asportation Security Administration and became【C14】______last month, also reduces pat-downs(搜身检查)of children, though doesn’t【C15】______eliminate. Now, children may be【C16】______through detectors or image machines multiple times to【C17】______for traces of explosives, instead of a pat-down.【C18】______must still go through the usual drill of removing shoes, jackets, belts and watches:【C19】______out laptops and cellphones: and making sure their 3.4-ounce rubes of toothpaste is【C20】______sealed in a plastic bag.
【C8】

选项 A、introduced
B、included
C、taken
D、came

答案A

解析 空格前有助动词have,由此可知此处应填动词的过去分词形式。根据句意“一些最明显的变化在过去的一年里已经被——”,由此推断此处应填入一个含有“介绍,引进”意思的词,结合选项,选择introduced。
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