Bothhisparentslooksad．Maybethey___

发布时间：2020-07-10 05:17:19

Both his parents look sad．Maybe they ________ what's happened to him．













A.knew












B.have known











C.must know











D.will know

网友回答

B解析从题意分析，本题的前一个句子应说明一个结果，后一个句子则说明一个原因．这个原因所表示的动作目前为止已经发生．故本题应用现在完成时，
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