—When are you going to fly to Taiwan this summer?— we finish school. It will be a great ho

问题补充：

—When are you going to fly to Taiwan this summer?

— we finish school. It will be a great holiday.

A. Because

B. Since

C. Even though

D. Only if

答案：

A. Because

B. Since

C. Even though

(答案→)D. Only if

解析：Because因为;Since由于,自从……以来；Even though虽然，即使；Only if除非，只有。句意：这个夏天你打算什么时候做飞机去台湾？——只有当我们放假的时候，那会是一个不错的假期。结合语境可知选S。