The experiment shows that proper amounts of exercise, if  __  regularly, can improve our health.
#97485
A
being carried out
B
carrying out
C
carried out
D
to carry out
推荐题目
_____ in thought, he sat at the edge of the bed, with his eyes _____ on the letter in his hand.
#94454
A
Lost; fixing
B
Losing; fixed
C
Lost; fixed
D
Losing; fixing
Isn't it time you got down to        the papers?
#90430
A
mark
B
be marked
C
being marked
D
marking
Whom do you think Mary will _________ into the matter instead of her?   
#88563
A
have looked
B
have to look
C
have had looking
D
have look