careful as she is,____ she makes some spelling mistakes occasiona_英语解答

careful as she is,____ she makes some spelling mistakes occasionally.
a.but
b.yet
答案为B,为什么呢?请简述BUT YET的区别~~~
另外,此处若不填可以吗?

人气：479 ℃　时间：2019-10-23 10:37:46

解答

此处不填即可,因为本身就是一个完整的句子.
填yet也可以,轻微的转折.