The problem is too difficult for him. He _______ solve it by himself without any help.A.can'tB.mustn'tC.shouldn'tD.needn't
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A解析试题分析：can't不能，不可能；mustn't禁止；shouldn't不应该；needn't不必。句意：这个问题对他来说太难。没有帮助他自己不可能自己解决。故选A。考点：情态动词辨析
点评：情态动词的考查是初中英语考查的重点，平时学习中一定要熟记这些词的基本词义及用法上的不同，注意其用法及在句子中表达语气的不同。考试中结合语境选择合适