To pay to see that movie seems foolish you can see it on television for free.A. beforeB.

问题补充：

To pay to see that movie seems foolish you can see it on television for free.

A. before

B. though

C. when

D. once

答案：

A. before

B. though

(答案→)C. when

D. once

解析：此处when意为：既然。before 在……之前；though虽然； once一旦。句意：既然你能在电视上免费看那部电影，你花钱看那部电影似乎很愚蠢。根据句意选C。