首先,这是一个倒装句.
当把Not until至于句首时候,必须使用倒装句,
其次,这里之所以要用did而不用had,是因为这里陈述的是过去的一个事件,
没有过去完成时态的含义,所以,不能用过去完成时,
只能用一般过去式,所以要用did.
明白了吗?
Not until the late 18Th century_____the Antarctic cricle but
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