After the hurricane, the army was ________ to cut through fallen trees and to help clear the paths.A.called onB.called backC.called inD.called up
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C解析call on①（＝visit）意为“拜访”；②call on sb. to do sth.意为“号召做”；call back意为“叫回来，回电话（在对方打电话来以后）”；call up意为“使人想起”。call in意为“把某人请来，召集”，符合句意。