— I wonder ________ you’ll water this kind of flower. 
—Once a week.
A．how oftenB．how longC．how soonD．how much
A
考查疑問詞：A. how often多久一次，B. how long多長時間C. how soon多快，D. how much多少，從答語：once a week，可知選A。句意是：我想知道你要多長時間澆一次這種花。--一星期一次。
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