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          _________ caused the accident is still a mystery.
          A．HowB．WhatC．ThatD．Where
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：什么事情引起的這個(gè)事故仍然是一個(gè)謎。這里是what引起的主語(yǔ)從句，what在從句中作主語(yǔ)，從句作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞一般情況下應(yīng)該單數(shù)；that在主語(yǔ)從句中，不作成分；how與where不能在從句中做主語(yǔ)，因?yàn)檫@里缺少的是主語(yǔ)從句的連詞，并且連詞在從句中作主語(yǔ)，故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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