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They watch TV__________.
A.one a weekB.once a weekC.one the weekD.once week
B

试题分析:表示频率的短语的结构是“次数+时间段”,once“一次”,a week“一周”,故只有B符合要求,本句的意思是“他们看电视每周一次。”所以本题选B。
点评:本题实际上考查频率词的构成“次数+时间段”。应注意一种情况:只有次数,并不表示频率。提问频率用how often,而提问次数用how many times。
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