In some western countries, demand for graduates from MBA courses has ________.
A.turned downB.turned overC.fallen downD.fallen over在线课程C
解析：
fall down: to fail or to be ineffective失败，不起作用。如：①Where this plan falls down is that it doesn't allow enough time for possible delays.这个计划的不足之处在于它没有留出足够的时间以防可能出现的种种耽搁。②You've been falling down on the job recently, is there anything troubling you?你最近的工作一直不好，有什么事情使你烦恼吗？fall over倒下；
turn down把（收音机、电视机等）声音关小，拒绝；
turn over仔细考虑，把……移交。