In the United States there are, strict speaking, no national 【M1】______ holiday, for each state must, through legislative enactm

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问题     In the United States there are, strict speaking, no national 【M1】______
holiday, for each state must, through legislative enactment or executive 【M2】______
proclamation, appoint the day which each holiday is celebrated. 【M3】______
    Congress and the president may establish legal holidays for the District
of Columbia and for federal employees throughout the states and territo
ries; and by long custom, days that receive nationwide observation, such 【M4】______
as Christmas, Thanksgiving, Labor Day, Independent Day, and New Year’s 【M5】______
Day, are uniformly set apart by all states as legal, or public, holidays. In 【M6】______
1968 federal legislation established Columbus Day as a legal holiday for the
District of Columbia and for the federal government beginning at 1971. The 【M7】______
law also provided begun in 1971 federal employees would be granted three- 【M8】______
days weekends by observing Washington’s Birthday on the third Monday in 【M9】______
February, Memorial Day on the last Monday in May, Columbus Day on the
second Monday in October, and Veteran Day on the fourth Monday in Octo
ber. By 1971 most of the states also adopted the new dates. 【M10】______
【M10】

选项

答案∧also — had

解析 如果一个句子里有by引导的时间状语从句则动词一般用完成体,因此这里最好将adopt换成had adopted。
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