选 2..has
这是现在完成时,现在完成时的结构是have/has done (过去分词）
因为he 是第三人称单数,因此助动词用has,并且read的过去分词还是read,(读音变了）
twice 这是现在完成时的提示词
He （ ） read this book twice.1.is 2.ha
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