We thought they had come to repair the phone, but ________, they were robbers.
in reality：实际上，事实上;in addition：另外，此外;in return：作为报答，作为回报;in vain：徒劳地，白费力气地 题意：题意：我以为他们是来修电话的，但事实上他们却是贼。答案选A。