题目内容
19．-When do you usually go to see your grandparents，Lily．-I usually go to see ________ Sunday．（ ）
| A． | in | B． | for | C． | on | D． | at |
分析 --你通常什么时候去看你的祖父母，莉莉．
--我通常在星期天去看祖父母．
解答 答案：C．in表示较长时间；at 经常用在具体的时刻前；on表示具体某一天的早上、下午或晚上；for后跟一段时间，故选C．
点评 英语中表示时间的介词，表示时间的某一点、某一时刻或年龄等用at；泛指一般意义的上午、下午或晚上以及月或年等较长的时间，一般用in；表示星期几或某一特定的日期，用on．
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