The troops themselves to go into battle.A. preparedB. were preparedC. to prepareD. prepa

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(答案→)A. prepared
B. were prepared
C. to prepare
D. preparing
解析：
考点分析：动词的语态 prepare oneself to do sth 准备做某事。军队正准备进行战斗。prepare sb. for sth.  为某人准备某事 （做及物动词）They prepared themselves for the worst. 
他们作了最坏的打算。