题目选项分析

In August, the Williamstown main city parking garage was completely full every single day of the month. This phenomenon indicates that the main city parking garage in Williamstown is a popular place for parking. herefore, the Williamstown parking garage will be full every day of the month for September.

Which of the following, if true, cast the most doubt on the conclusion above?

【选项】In July, the Williamstown parking garage was full every day of the month.