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此題考查 not…until… 用于強調句的句式，即 it wasn’t until…that…（直到……才……）。如：

It wasn’t until last year that I saw my mother again. 直到去年，我才再次見到我母親。

It wasn’t until he saw her that he felt happy. 直到他見到了她，他才感到高興。

It was not for several years that I had an opportunity of seeing them. 我好幾年都沒有機會見到他們。