Nancy was surprised that they have ______. They seemed to be a happy couple.
split up
broken down
fallen through
knocked out
答案及解析：本题考查动词词组的词义辨析。A选项，句意：南希对他们的离婚表示十分惊讶，因为他们似乎是一对快乐的夫妇。split up意为“分裂，离婚”，综上，A选项正确。B选项，break down意为“（精神方面）垮 掉;（健康）变得衰弱;崩溃”，故排除。C选项，fall through意为“失败;成为泡影”故排除。D选项，knock out意为“使筋疲力尽”，故排除。故正确答案为A 项。
