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
In order to improve English, ________________.
#86097
A
Jenny’s father bought her a lot of tapes
B
Jenny bought a lot of tapes for herself
C
a lot of tapes were bought by Jenny
D
a lot of tapes were bought by Jenny’s father
  the pencils ? They’re in the pencil box.
#43707
A
What are
B
Where are
C
Who are
D
Where is