Peter graduated from university in 1998. He ____ in a high school ever since.
A．worksB．is workingC．workedD．has worked
D

試題分析：考查時(shí)態(tài)。根據(jù)關(guān)鍵的時(shí)間狀語。Ever since從那以后，與現(xiàn)在完成時(shí)連用，故D正確。
點(diǎn)評(píng)：時(shí)態(tài)的考查要抓關(guān)鍵詞本題的關(guān)鍵詞是ever since，故與現(xiàn)在完成時(shí)連用。
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