Rewrite the sentences, beginning with the given words. (10 p)
People don't do enough exercise, so there are a lot of heart diseases.
A.If people had done enough exercise, there wouldn't be a lot of heart diseases.
B.If people did enough exercise, there wouldn't be a lot of heart diseases.
C.If people did enough exercise, there wouldn't have been a lot of heart diseases.
D.If people had done enough exercise, there wouldn't have been a lot of heart diseases.

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