1. Under the Safe Drinking Water Act, the Environmental Protection Agency is required either to approve individual state plans for controlling the discharge of wastes into underground water or that they enforce their own plan for states without adequate regulations.
(A) that they enforce their
(B) for enforcing their
(C) they should enforce their
(D) it should enforce its（E）
(E) to enforce its
为什麽这里表目的用for controlling
approve individual state plans for controlling the discharge of wastes
approve ... for .... 应该不是固定用法，for 只是表示为了... 而 approve
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