单选题Some museums in San Francisco are open every day, but some are only open ______.Aon weekdaysBon weekendsCon certain daysDon holidays
单选题
Some museums in San Francisco are open every day, but some are only open ______.
A
on weekdays
B
on weekends
C
on certain days
D
on holidays
参考解析
解析：
细节理解题。第一段第五句提到“Some are only open on certain days. ”可知，答案选C正确。
细节理解题。第一段第五句提到“Some are only open on certain days. ”可知，答案选C正确。
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