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

          [  ]

          A.

          knew

          B.

          have known

          C.

          must know

          D.

          will know

          答案:B
          解析:

            現(xiàn)在完成時(shí)主要強(qiáng)調(diào)過(guò)去發(fā)生的動(dòng)作對(duì)現(xiàn)在造成的影響,或過(guò)去發(fā)生的動(dòng)作還未結(jié)束,一直持續(xù)到現(xiàn)在或?qū)?lái)。根據(jù)上下文分析、推理,正確答案是B。


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