A. | knew | B. | have known | C. | must known | D. | will know |
分析 他的父母看起來很傷心,也許他們知道他發(fā)生了什么.
解答 答案:B.結(jié)合句意可知know的動(dòng)作發(fā)生在過去,對(duì)現(xiàn)在造成一定的影響,故用現(xiàn)在完成時(shí)have/has+過去分詞,主語they,故have,故答案是B.
點(diǎn)評(píng) 現(xiàn)在完成時(shí)有兩種用法1.過去發(fā)生的某一動(dòng)作對(duì)現(xiàn)在造成的影響或結(jié)果或到現(xiàn)在為止已經(jīng)發(fā)生或完成的動(dòng)作.2.表示過去發(fā)生的、持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài).
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