you         Chicago?
A. Are; visit          B. Are; visited      C. Did; visit
C

試題分析：句意：你參觀過芝加哥嗎？be動詞和動詞連用只有兩種形式，一是be動詞+現(xiàn)在分詞，而是be動詞+過去分詞。本句中參觀的動作和句子主語是主動關(guān)系，故只能選C。
點評：英語每種時態(tài)都有比較固定的句子結(jié)構(gòu)，熟記這些基本的結(jié)構(gòu)是學好英語的關(guān)鍵。
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