it was __(until/ when) he was 11 that his talent for writing beca_英语解答

it was __(until/ when) he was 11 that his talent for writing became obvious.
选哪个答案对呢?为什么?
如果用not until

人气：202 ℃　时间：2019-10-17 00:51:12

解答

选WHEN
这是个强调句,不缺成分,去掉IT WAS THAT,还原句子,很清楚的．还原一下UNTIL,是错的．
但NOT UNTIL是可以的,It's not until.that.
这是个固定句型,直到．．．才．．．．
这里是可以的．