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--Why does the lake smell terrible?  

--Because large quantities of water       ．

A．have polluted                                           B．is being polluted

C．has been polluted                                     D．have been polluted

—Why does the lake smell terrible?
—Because large quantities of water _____.

—Why does the lake smell terrible?
—Because large quantities of water______.          

— Why does the lake smell terrible?
— Because large quantities of water______.          

--- Why does the lake smell terrible?
--- Because large quantities of water _________.

--Why does the lake smell terrible?    
---Because large quantities of water ______.

— Why does the lake smell terrible?
— Because large quantities of water ____.

— Why does the lake smell terrible?

— Because large quantities of water ____.

A．have polluted                          B．is being polluted

C．has been polluted                       D．have been polluted

--Why does the lake smell terrible?    

---Because large quantities of water ______.

A．have polluted                          B．is being polluted

C．has been polluted                       D．have been polluted

--- Why does the lake smell terrible?

--- Because large quantities of water _________.

A．have polluted                          B．is being polluted

C．has been polluted                       D．have been polluted