Playing QQ’s “Happy Farm” by planting, watering, fertilizing and harvesting vegetables, fruits and flowers, we can find out all the excitement is about.
A. that
B. if
C. when
D. what
网友回答
A. that
B. if
C. when
D. what
解析：考查连词。find out后引导的是宾语从句，从句中缺少about后面的宾语，故用what