The bus was held up by the snowstorm, ________ causing delay.

The bus was held up by the snowstorm, ________ causing delay.
A、otherwise
B、nevertheless
C、thus
D、since
【正确答案】：C
【题目解析】：otherwise否则；nevertheless然而；thus因此；since自...以后
句意：公共汽车被暴风雪耽搁了，因此耽搁了。