The old man's clothes, () old an

The old man's clothes, () old and worn, looked clean and of good quality.
A、if
B、when
C、though
D、since
【正确答案】：C
【题目解析】：句意：这位老人的衣服虽然又旧又破，但看上去干净整洁，质量很好。f意为"如果”，when意为当时候”，though意为"虽然”，since意为"因为”，故选C。此处是though引导的让步状语从句的省略现象，当though引导的从句中的主语与主句主语相同，且从句的谓语又是he动词时，那么从句中的主语和 be动词可以省略，补充完整为"though they were old and worn"。