You should never base anything on a theory that _________ impractical in practice.  
#86010
A
is proved
B
prove
C
proves
D
proved
推荐题目
–Where _______ the socks?   --_______ on the bed.
#43588
A
is; It’s
B
are; They
C
are; They’re
D
is; It
______ without friends ______ the most difficult challenge for Chuck while living on the island.
#85606
A
How to survive, is
B
How does he survive, are
C
How does he survive, is
D
How to survive, are
.One out of three villagers                  a new school in the village.
#86162
A
advocates to build
B
advocate to build
C
advocates building
D
advocate building