___________introduced into the boxing sportA Not until 1860 had the use of glovesB Not until 1860 had the was of glovesC It was not until 1860 was the use of the glovesD It was not until 1860 that the use of gloves had been

___________introduced into the boxing sportA Not until 1860 had the use of glovesB Not until 1860 had the was of glovesC It was not until 1860 was the use of the glovesD It was not until 1860 that the use of gloves had been
___________introduced into the boxing sport
A Not until 1860 had the use of gloves
B Not until 1860 had the was of gloves
C It was not until 1860 was the use of the gloves
D It was not until 1860 that the use of gloves had been

___________introduced into the boxing sportA Not until 1860 had the use of glovesB Not until 1860 had the was of glovesC It was not until 1860 was the use of the glovesD It was not until 1860 that the use of gloves had been
D,D是强调句,去掉It was …… that,句子就成了 not until 1860 the use of gloves had been introduced into the boxing sport.
the use of gloves是主语,had been introduced表示被动,而且因为 not until 1860是有时间提示的,所以要过去完成被动式.
A没倒装
B双谓语
C句法不对
好久没读英语,有解释错的请指出,

a

D
被动
强调句

D 首先是强调句，就是it was ... that这个句式，把它去掉就是原句了
ABC都少been，这里要被动

not until句式强调1860这个时间~后面是宾语补足语修饰时间1860。

可能是B吧