Tom ________ in the library every night over the last three months.
A. works
B. worked
C. has been working
D. had been working
Tom ________ in the library every night over the last three months.
A. works
B. worked
C. has been working
D. had been working
C
解析：句意：“在最近的三个月里汤姆每晚都在图书馆里工作。”由“over the last three months”可知，该句应用现在完成时，由句意可知，动作发生于过去，一直持续到现在，故用现在完成进行时。故选C项。