A

解析試題分析：句意：你不能進(jìn)去。考試已經(jīng)開(kāi)始了30多分鐘。for+一段時(shí)間，往往用于現(xiàn)在完成時(shí)，且謂語(yǔ)動(dòng)詞應(yīng)是持續(xù)性動(dòng)詞。故選A。
考點(diǎn)：考查現(xiàn)在完成時(shí)的用法。

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