The river has been polluted worse and worse．We must _______ new ways to solve the problem．
A．catch up with B．keep up with C．come up with D．make up with
科目：初中英語(yǔ) 來(lái)源： 題型：
The river has been polluted worse and worse．We must _______ new ways to solve the problem．
A．catch up with B．keep up with C．come up with D．make up with
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