Question

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

1. A.
   before
2. B.
   until
3. C.
   unless
4. D.
   where

Answer 1

D
before在……之前，until直到 unless除非 where在……地方，句意为，我听不清那个教授在讲什么，因为在我现在坐的地方噪音太大。故选择D项。
【考点定位】考察连词的用法。