how long have you been playing basketball ?

題目：

how long have you been playing basketball ?
A .sometimes B .in tow days C. for tow hours

解答：

答案：C
解析：由句子中的how long可知此處提問的一段時間.在三個選項中只有for two hours是一段時間,而sometimes是「有時」表示頻率,應用how often來提問；in two days表示「兩天以後」,應用how soon來提問.只有for two hours用how long提問.
祝開心.