Bring chicken broth to a boil in heavy large saucepan. Mix in couscous.. Cover and remove from heat. Let stand 10 minutes. Transfer couscous to large bowl; fluff with fork. Set aside.
Mix lemon juice, vinegar, mustard and garlic in small bowl. Whisk in oil. Add green onions, garbanzo beans, cucumber, olives, parsley, mint and dressing to couscous; toss well. Add cheese and toss gently. (can be made 6 hours ahead. Cover and chill.)
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