I cannot hear the professor clearly as there is too much noise ________ I am sitting.
A．beforeB．untilC．unlessD．where
D
before在……之前，until直到 unless除非 where在……地方，句意為，我聽(tīng)不清那個(gè)教授在講什么，因?yàn)樵谖椰F(xiàn)在坐的地方噪音太大。故選擇D項(xiàng)。
【考點(diǎn)定位】考察連詞的用法。
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