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高中英语
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单选题
1.
(2020高二下·天津期末)
Only when the circuit breaker mechanism was triggered
what a negative impact the epidemic had made on the country's economy.
A .
had they realized
B .
they realized
C .
they realize
D .
did they realize
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备考2022年高考英语一轮复习20:倒装句(1)