PEOPLE CUT DOWN A LOT OF TREES SO THE ENVIRONMENT IS SERIOUSLY PO...

111. People cut down a lot of trees so the environment is seriously polluted

A. If people don’t cut down a lot of trees, the environment are not seriously polluted.

B. If people didn’t cut down a lot of trees, the environment were not seriously polluted.

C. If people hadn’t cut down a lot of trees, the environment were not seriously polluted.

D. If people didn’t cut down a lot of trees, the environment could not seriously polluted.