Question

5. this is only a small town,it's crowded with tourists who come here all year round.

   A. Since   B. Unless

   C. Once   D. Although

Answer 1

5. D

5. D解析；句意：虽然这只是一个小城 镇，可全年都挤满游客。根据句意可知 要用although引导让步状语从句。