实施主营业务收入的截止测试，主要是为了发现主营业务收入账户中可能存在的（ ）。
实施主营业务收入的截止测试，主要是为了发现主营业务收入账户中可能存在的（ ）。A
截止
By the end of the next month, you _____ here for three years.
By the end of the next month, you \_\_\_\__ here for three years.
The children _____ happily in the classroom when the teacher came in.
The children \_\_\_\__ happily in the classroom when the teacher came in.
