The soldier raised his gun and calmly ------ it at the enemy

你可以把句子的语序换成 The soldier raised his gun and fired,calmly aiming it at the enemy commander.raise 和fire是两个并列的动作,所以都用过去时 而作为修饰fire这个动作的aiming it at the enemy commander,表示同时发生的伴随状语,所以用分词