“The children are playing in the park.”The main structure of the sentence is______.

A.S+V B.S+V+DO+OCC.S+V+IO+DO D.S+V+P

“The children are playing in the park.”The main structure of the sentence is______.

Look! The children are playing ______ in the park．

1. A.
   happy
2. B.
   happily
3. C.
   glad
4. D.
   nice

Look! The children are playing ______ in the park．　　　

[　　]

A．happy　　　B．happily　　　C．glad　　　D．nice