On the most basic level, sentence equivalence questions evaluate your reading comprehension with fill-in-the-blank vocabulary questions.
The Rules
Example Question
Rather than openly denouncing his opponents, the mayor launched a(n) _____ campaign to dissolve their credibility.
A. Clandestine
B. Empirical
C. Improvident
D. Surreptitious
E. Censorious
F. Spurious
One blank and six possible words to go in the blank.
There are two that you could plug into the sentence to make the sentence as a whole mean the same thing.