<p>had theresa (rode) a bicycle instead (of driving) to work, the additional travel time (would have been) offset by the time she took (to find) parking.
i saw a and b were nor parallel but i choose (of driving) i thought it was supposed to be drove. the answer is (rode) and i dont know why</p>
<p>Had +v3 = had ridden 
</p>
<p>so why is it not driven? i thought both of them are wrong and i didnt knew which more</p>
<p>ridden is the past participle of ride. It’s a TOEFL error, honestly.</p>
<p>SAT books emphasize parallelism errors, but that doesn’t mean you should see them all over the place. “Instead of” is a prepositional phrase, which means it must be followed by a noun phrase; because a noun is required, a gerund is used in place of a verb. That rule trumps everything else.</p>
<p>But really, forget about rules. Just get the sound of the idiom in your head: instead of verb+ing. It comes up all the time.</p>
<p>thx you explained it perfectly </p>
<p>regarding post #2: had Ridden --> of driving <or> had ridden --> of having driven. Either works. “of driven” does not.</or></p>