A

解析試題分析：句意：你不能進去�？荚囈呀�(jīng)開始了30多分鐘。for+一段時間，往往用于現(xiàn)在完成時，且謂語動詞應(yīng)是持續(xù)性動詞。故選A。
考點：考查現(xiàn)在完成時的用法。

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