—How often do the students play sports?
A．Twice a dayB．Since last nightC．For two hoursD．A month ago
A
考查疑問副詞短語的答語。上文用how often（多久一次）提問，下文需是表頻度的答語。故選A。twice a day“每天兩次”。【易錯分析】B項和C項常用于現(xiàn)在完成時，D項常用于一般過去時。
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