题干
.
Every year in April, the Water Festival ______ among the Dai people in Xishuangbanna.
Every year in April, the Water Festival ______ among the Dai people in Xishuangbanna.
A：celebrate
B：is celebrating
C：is celebrated
D：is being celebrated
答案(点此获取答案解析）
C
(R、R'、R"代表烃基或氢)