高中英语,关于untilUntil then ( ) the secret that his parents had kept for 20 years.A.he knewB.did he know答案给的是B,为什么?

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高中英语,关于untilUntil then (         ) the secret that his parents had kept for 20 years.A.he knewB.did he know答案给的是B,为什么?
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高中英语,关于untilUntil then ( ) the secret that his parents had kept for 20 years.A.he knewB.did he know答案给的是B,为什么?
高中英语,关于until
Until then ( ) the secret that his parents had kept for 20 years.
A.he knew
B.did he know
答案给的是B,为什么?

高中英语,关于untilUntil then ( ) the secret that his parents had kept for 20 years.A.he knewB.did he know答案给的是B,为什么?
Until 在前,半倒装,本来是he knew 加一个助动词,因为 ‘知道’也是过去式,所以用 did

unil 提前,主谓倒装