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
【正确答案】
A
【答案解析】
解析：本题考查强调句的用法。强调句型为it is+强调部分+that／who…，本题强调的部分是not until it got dark，后面不需要再用否定，所以正确答案为A。
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