is expected that it will be fine tomorrow when we can do some outdoor activitiesA. AsB.

问题补充：

is expected that it will be fine tomorrow, when we can do some outdoor

activities．

A. As

B. It

C. That

D. Which

答案：

A. As

(答案→)B. It

C. That

D. Which

解析：考查it做形式主语的用法：句型是：It is expected that…,that引导的才是真正的主语，句意是：大家都认为如果我们能做些户外活动对今后都是好的。选B。