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

試題分析：表示頻率的短語(yǔ)的結(jié)構(gòu)是“次數(shù)+時(shí)間段”，once“一次”，a week“一周”，故只有B符合要求，本句的意思是“他們看電視每周一次。”所以本題選B。
點(diǎn)評(píng)：本題實(shí)際上考查頻率詞的構(gòu)成“次數(shù)+時(shí)間段”。應(yīng)注意一種情況：只有次數(shù)，并不表示頻率。提問頻率用how often，而提問次數(shù)用how many times。
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