WRITING QUESTION. what is this madness

Test Preparation SAT Preparation
1

<ol>
<li>New Zealand A(had fostered) a thriving local music scene B(for decades), but it was not until the late 1980s C(when) New Zealand musicians began D(to reach) international audiences. E(no error).</li>
</ol>

<p>So the answer is C. WHY?</p>

2

<p><a href=“http://talk.collegeconfidential.com/sat-preparation/1261859-sat-writing.html[/url]”>http://talk.collegeconfidential.com/sat-preparation/1261859-sat-writing.html&lt;/a&gt;&lt;/p&gt;

<p><a href=“http://talk.collegeconfidential.com/sat-act-tests-test-preparation/1261858-writing-section-sat.html[/url]”>http://talk.collegeconfidential.com/sat-act-tests-test-preparation/1261858-writing-section-sat.html&lt;/a&gt;&lt;/p&gt;

<p>Explanations for why it should not be “when”. Instead, it should be “that”</p>

3

<p>wait “it is” and “that” is a parallel structure?</p>

<p>I NEVER HEARD OF THIS BEFORE?</p>

4

<p>“not until” and “that” is the parallel structure
It’s an idiom: It was not until … that …</p>