171.I knocked over my coffee cup.It went right over ____ keyboard.
You shouldn't put drinks near ____ computer.
A.the;/
B.the;a
C.a;/
D.a;a
172.Of all ____ reasons for my decision to become a university pfofessor,my father's advice was ___ most important one.
A.the;a
B./;a
C./;the
D.the;the