题目内容

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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