It was ____ the old worker came that we ____ the  experiment.
A．until; didn’t beginB．not until; began
C．until; beganD．not until; didn’t begin
B                       
本題句式結(jié)構(gòu)為強(qiáng)調(diào)句型。強(qiáng)調(diào)until引導(dǎo)的時(shí)間狀語(yǔ)從句,要把not放于until之前。  
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