A. is beating
B. has been beating
C. has been beaten
D. beats
Past perfect continuous tense is used when a work is being continued for some time from the past. has been beating is the most suitable option.
A. is beating
B. has been beating
C. has been beaten
D. beats
Past perfect continuous tense is used when a work is being continued for some time from the past. has been beating is the most suitable option.