18．He  looks  so happy．Maybe  he ________he won the first  prize．（　　）
A．knowsB．knewC．has  known

分析 他看起來(lái)很高興．也許他已經(jīng)知道了他獲得了一等獎(jiǎng)．

解答 答案：C．考查動(dòng)詞時(shí)態(tài)．句意"他看起來(lái)很高興．也許他已經(jīng)知道了他獲得了一等獎(jiǎng)．"現(xiàn)在完成時(shí)，一種是強(qiáng)調(diào)過(guò)去對(duì)現(xiàn)在的影響，另一種指動(dòng)作從過(guò)去延續(xù)到現(xiàn)在，也就是經(jīng)常說(shuō)的延續(xù)時(shí)．根據(jù)題干He looks so happy．Maybe he ________he won the first prize．可知是說(shuō)他看起來(lái)很高興．也許他已經(jīng)知道了他獲得了一等獎(jiǎng)．用現(xiàn)在完成時(shí)has known．故選C．

點(diǎn)評(píng) 仔細(xì)分析句子的結(jié)構(gòu)，根據(jù)具體的內(nèi)容作答．

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