A good film producer must make sure that his films fit into the needs of the changing mar

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(答案→)A. are to
B. will
C. are going to
D. are about to
解析：考查将来时的表达法。Be to do sth表示计划的事情；表示注定要做某事；也可以表示命令做某事，相当于have to, must，should; will表示一般的将来，或者临时决定做某事；be going to do sth表示按照计划安排要做某事；或者根据某种迹象要做某事；be about to do sth即将做某事，不与表示将来时的时间状语连用。句意：好的电影出品人要确保他的电影应该满足不断变化的市场的需要。该句中的be to =should.故A正确。