Question

选出意思与画线部分相同的选项   He was ill, so he couldn't come.

1. A.
   therefore
2. B.
   and therefore
3. C.
   but
4. D.
   although

Answer 1

B
so作为连词连接结果状语从句，相当于and therefore，故B项正确。therefore是副词，可以承上启下地连接两个句子，其前常用分号或与and连用。如：He was ill；therefore he didn't come. /He was ill and therefore he did not come. (他病了，所以没来。)