Only when _________ the tea-house _______ it was the same place he’d been in last year.
[     ]
A. did he reach; he realized      
B. he reached; he realized
C. he reached; did he realize    
D. did he reach; did he realize
Not until the early years of the 19th century ________ what heat was.
[      ]
A. man did know      
B. did man knew        
C. didn't man know        
D. did man know
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