But over the decades that _________, DuPont pumped hundreds of thousands of pounds of PFOA powder through the outfall pipes of its factory into the river.<br>· follows<br>· followed<br>· following<br>·to follow

But over the decades that _________, DuPont pumped hundreds of thousands of pounds of PFOA powder through the outfall pipes of its factory into the river.
· follows
· followed
· following
·to follow

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