The writer could not help blushing for his ______. ( )

A．lay right on one side of a shelf
B．was right behind as old brown-looking case
C．was between two high shelves
D．was among the hundreds of cases

A．The receipt had been stolen by someone.
B．someone had taken away the case.
C．He could not claim his case without the receipt.
D．He had left his receipt at home.