【題目】(2017·安慶四中月考)It ________ discovered ________ the 17th century.

A. wasn’t; until B. didn’t; until

C. didn’t; before D. doesn’t; till

【答案】A

【解析】句意:直到十七世紀(jì)它才被發(fā)現(xiàn)。根據(jù)語義可知,主語與謂語之間是被動(dòng)關(guān)系,因而使用被動(dòng)語態(tài):be+動(dòng)詞的過去分詞。discovereddiscover的過去分詞。故選:A。

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