Although the old man was poor,___ he was willing to help the homeless orphans.
问题描述：
Although the old man was poor,___ he was willing to help the homeless orphans.
a.yet b.and c.but d.so
选A
答
从语义上讲,是转折：虽然老人很穷,但是他仍然想帮助无家可归的孤儿.
yet和but都表转折,但but不能跟although连用.
因此选择yet