—The door was open.
    —It ______ open. I had locked it myself and the key was in my pocket.

I ______ writing the paper as scheduled, but my mother’...

单项选择题  I ______ writing the paper as scheduled, but my mother’s illness interfered. I hope you will excuse me.

By the time she is 50 years old, she ______ an inmate o...

单项选择题  By the time she is 50 years old, she ______ an inmate of the prison for over half of her life.

Such crimes may be so complex that months or years go b...

单项选择题  Such crimes may be so complex that months or years go by before anyone ______ them.