2.I often saw you read in the library d_____ the summer holidays.

2.I often saw you read in the library d_____ the summer holidays.
2.I often saw you read in the library d_____ the summer holidays.

2.I often saw you read in the library d_____ the summer holidays.
I often saw you read in the library 【during】 the summer holidays
暑假期间,我经常看见你在图书馆看书.( ⊙ o ⊙ )

during
望采纳