【单选题】It was not until it got dark ______ working.
A．that they stopped
B．when they stopped
C．did they stop
D．that they didn't stop
网考网参考答案：A
网考网解析：
本题考查的是强调句型。It is not until...that是对not...until结构的强调，意思是“直到什么时候才……”。本句的意思是：“直到天黑他们才停止工作。”
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