问题

PSAs are often run _ free, and are __ to educate people about health, safety, or any other problem that affects public welfare

A:for, mean
B:for, meant
C:of, to mean
D:in, meaning

正确答案是：

同类题型

27．In hot weather, an old tyre can break again easily _____it’s mended

Her talent show was in great _______.

The old woman is lonely (孤独的). I often hear her say to .

What a table! I’ve never seen such a thing before. Itis____long.

Some people do some _____work without getting any money in return . These people are called volunteers.