Only when ________ to explain _______ the reason for this.
A. did he start; she realized B. he started; did she realize
C. did he start; she had realized D. he started; had she realized
Only when ________ to explain _______ the reason for this.
A. did he start; she realized B. he started; did she realize
C. did he start; she had realized D. he started; had she realized
B