9.Bach died in 1750, but it was not until the early 19th century____ his musical gift was fully recognized.
A
while
B
though
C
that
D
after
强调的是until引导的时间状语。译为Bech于1750年去世，但是直到19世纪初，他的音乐天赋才被认可。
it is/ was +被强调部分+that/who+句子的其他成分。
对强调句型掌握不够牢固。