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          —I think trees ____________ twice a week in such hot weather.
          —Yes, I agree. Or they may die without water.
          A．must water.B．a(chǎn)re watered.
          C．must be planted.D．must be watered.
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：--我認(rèn)為，在如此熱的天氣中，樹應(yīng)該一個(gè)星期澆兩次水。--是的，我同意。否則他們可能會(huì)因?yàn)槿彼廊�。分析：考查被�?dòng)語態(tài)的用法，構(gòu)成：be +done（動(dòng)詞的過去分詞）；本句考查情態(tài)動(dòng)詞的被動(dòng)語態(tài)。構(gòu)成must be +done（動(dòng)詞的過去分詞）。故選 D
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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