符合华盛顿州课程的在线课堂。
获得一年免費方法：
https://home.studyisland.com/purchase/select-product
Select Your state
Select Billing type as Annual
Select Subscription as Single License or Family License
Select Subject as All Available Subjects
Select Continue
Enter Your Account Information
Select Review Order
Confirm Your Selection and Select Place Order
A code and credit card are no longer needed to register.