Which of the following sentences is INCORRECT?
A.I’ll finish the work in the morning.
B.We went to Turkey in June.
C.Let’s go to the cinema in the weekend.

三个选项中一个是错误的。那么C项肯定是错的。英国英语说at the weekend, at weekends, 美国英语说on the weekend, on weekends. in the weekend是错误的说法。是介词使用错误。