when前面可以跟时间吗

题目

when前面可以跟时间吗
题：New Zealand had fostered a thriving local music scene for decades,but it was not until the late 1980s "when" New Zealand musicians began to reach international audience.
这里when为什么不对

答案

it was not until the late 1980s "when" New Zealand musicians began to reach international audience.
这个句子是强调句,其构成方式为 it+be+被强调部分+that（who）+其它部分
本句中被强调部分是not until the late 1980s,根据语法要求,其后应当是that,而不能是when.
供参考.