<p>I bought the services from Collegeboard, and these are questions i got wrong and didn't really understand why.
<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>
<p>Answer is C but I'm not sure why. I chose A because i thought it would sound better with "fostered" not "had fostered." By the way, when do you use the word "had fostered" instead of "fostered," or "had been" or "have had been". Thanks.</p>
<li>The A(figures cited) in the report do not B(collaborate) the author's claim that small hospitals C(generally provide) better patient care D(than do) large ones. E(no error)</li>
<p>Answer says that its B, but I don't really get why. I chose D because i thought it should be "than those of". How do we know we can use "than do"?</p>