<li><p>Although the work schedule had been as meticulously prepared as it was supposed to be, the completion of the job was delayed by the unexpected resignations of several workers. No error.</p></li>
<li><p>Although there seems to be many ways to solve the puzzle, only one method will bring about the desired result. No error.</p></li>
</ol>
<p>What are the answers and why?</p>
<ol>
<li><p>I think no error.</p></li>
<li><p>"there seems" should be "there seem" because "many ways" is plural.</p></li>
</ol>
<p>I agree with the poster above me</p>
<p>Actually, there is an error in the first question...I thought it was no error too, but I was wrong.</p>
<p>Then the error must be C</p>
<p>...
why??
...</p>
<p>had been......was</p>
<p>that soudns funny</p>
<p>I believe it should be: to have been</p>