Words such as and, but, or, nor, for, yet, and so can combine clauses or phrases and are called conjunctions.
Conjunctions can be coordinating, when they combine to words or independent clauses, or they can be subordinating, when there are subordinate clauses involved.
Answer:
A. When I knew Don at UCLA, he wanted to work for the FBI.
Go,This car dealership sells hybrid sadans that go for the same price as gasoline-fueled vehicles.
Answer:(Nobody) had (not) toured the newspaper plant until now.
Explanation:
No one has toured the newspaper until now.