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				31．A．because        B．because of      C．a(chǎn)s             D．since			【查看更多】
			


		
           
          


		
          
		
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          Tom didn’t go hiking with his classmates ____ his illness. 
          A．because B．because of C．a(chǎn)s D．since 
          

			
          
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          We chose South Hill to have the picnic ________ the beautiful view．
          

          

          [　　]
          

          A．because
          

          

          B．because of
          

          

          C．as
          

          

          D．since
          

          

          

			
          
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          They can’t go out        the strong wind.
          A．because B．since 
          C．a(chǎn)s D．because of 
          

			
          
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          She didn’t go to work ___________ her health．
          


          A．because　　
          


          B．because of　　
          


          C．since 
          


          D．a(chǎn)s
          

			
          
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          --Why do plants have flowers?
          

          --________ the flowers make seeds.
          

          [　　]
          


          

          

          A．Because of
          		


          B．Because
          		


          C．As
          		


          D．Since
          		

          

          

          

			
          
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