✔ 最佳答案
他們正在看電視
They are watching TV那句正確
因為TV前面甚麼the /a都沒有
The & a的運用
a是在第一次描述那些事物時運用的
the是再描述之前已提及過的事物時運用的
For examples:
A boy is reading a book.The book is written by Paul Chan.
A computer is sold in a shop.The computer is expensive.
Hope this can help you!!