20．---When do you have art？
---We have art ______Tuesday and Thursday．（　�。�
A．inB．toC．onD．from

分析 --你們什么時候上美術(shù)課？
--我們在周二和周四上美術(shù)課．

解答 答案：C
當(dāng)表示時間時，in用于年、月、季節(jié)和泛指的早上、下午、晚上前；on用于日期、星期、具體的早上、下午、晚上前；to用于分鐘與整點間，表示差幾分到幾點；from后接時間點，表示從某個時候起，常與to連用，表示從…到…此處的Tuesday和Thursday是星期，要用on．

點評 此題首先要熟悉每個選項介意的用法，再結(jié)合題干，選擇正確的答案．

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