是填空吗?
The nurse is very tired ★but★she is still working very hard.
护士虽然很累,但仍在努力工作.and 可以吗是选择题不能说不可以，但从前后意思的连贯来说，还是用but来连接，表达这样一层意思，而且，出这道题的目的应该也是考你转折句的用法。如果这个空在前面，可以填Although 或ThoughAlthough/Though the nurse is very tired，she is still working very hard