What the science teacher does and says       of great importance to college students.
#85815
A
are
B
is
C
were
D
was
推荐题目
Four-fifths of the crop ______. 
#85690
A
are ruined
B
was ruined
C
were ruined
D
have been ruined
           of the land in my hometown            covered with trees and grass.
#85612
A
Two fifth ; is
B
Two fifth ; are
C
Two fifths ; is
D
Two fifths ; are
The girl in red ____my sister.
#44017
A
be
B
are
C
am
D
is