题目内容
17．When is the World Book and Copyright Day（世界读书日）？It's____23 April．（ ）
| A． | in | B． | at | C． | on | D． | during |
分析 世界读书日是什么时候？--时间是4月23日．
解答 答案：C 根据时间状语23 April，可知时间为具体到某一天（4月23日）．in+年、月、季节等；at+时间点；on+具体到某一天；during+时间段．故选C．
点评 本题考查时间介词的辨析．每一个时间介词，其后接的时间类型不同．熟记他们的用法是做题的前提．做题时要准确找到其后的时间状语，进而判断正确答案．
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