Suggestion: Hide multiple choice answers until mouseover or keystroke
As with my previous suggestion, this one would help practice translation by not giving us three pre-translated options. Let us ponder the sentence in our mind before we see three options. This way perhaps one wouldn't be tempted to just pick out a keyword and pick the right answer based on that.
This might not be a great idea for timed quizzes, but for run-of-the-mill multiple choice questions I think it would be a great addition.
Even if it's something you allow us to toggle ourselves. No need to make it mandatory.