Question

I cannot hear the professor clearly as there is too much noise ________ I am sitting.

A．before

B．until

C．unless

D．where

Answer 1

D

before在……之前，until直到 unless除非 where在……地方，句意為，我聽不清那個教授在講什么，因為在我現在坐的地方噪音太大。故選擇D項。
【考點定位】考察連詞的用法。