题目

“It’s not clear how she would have gained access to the roof by herself.Had she done so,the tanks themselves are not locked,” he told CTV’s Canada AM Wednesday.
在这句话中
Had she done so

提问时间：2021-03-26

答案

语法上面类似倒装句.
Had she done so, the tanks themselves are not locked =>
The tanks themselves are not locked for she done so.
done so是指前面那句话“have gained access to the roof by herself”