The experiment shows that proper amounts of exercise, if ______ regularly, can improve our health. 
#81315
A
being carried out
B
carrying out
C
carried out
D
to carry out
推荐题目
Never_____ to the foreign invaders, no matter how powerful they seem to be.
#79640
A
we can give in
B
we should give up
C
can we give in
D
should we give up
Not until he retired from teaching three years ago       having a holiday abroad.
#82402
A
he had considered
B
had he considered
C
he considered
D
did he consider
Not until actually ________ with water shortage ________ appreciate the value of water to a region.
#80996
A
facing; one can
B
faced; can one
C
faced; one cannot
D
facing; cannot one
The experiment shows that proper amounts of exercise, if ______ regularly, can improve our health. 
#81315
A
being carried out
B
carrying out
C
carried out
D
to carry out
_________ homework did we have to do that we had no time to take a rest.
#80253
A
So much
B
Too much
C
Too little
D
So little