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				 Every year millions of trees   ▲  to prevent floods, droughts and sandstorms.A. plant        B. are planted       C. are planting       D. were planted			【查看更多】
			


		
           
          


		
          
		
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          Every year millions of trees _____ to prevent floods, droughts and sandstorms. 
          

          [     ]
          A. plant 
          B. are planted 
          C. are planting 
          D. were planted 
          

			
          
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          Every year millions of trees ________ to prevent floods, droughts and sandstorms．
          

          

          [　　]
          

          A．plant
          

          

          B．are planted
          

          

          C．are planting
          

          

          D．were planted
          

          

          

			
          
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