(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

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