The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.
#89170
A
causing
B
being caused
C
to be caused
D
to have caused
推荐题目
_________ his friend when they met on the street made his friend very upset.
#91537
A
Tom didn’t greet
B
Tom’s not greeting
C
Tom not greeting
D
Not Tom greeting
. _______ different kinds of pianos, the workers farther improved their quality.
#97438
A
To produce
B
Being produced
C
Produced
D
Having produced
_____, he left the room.
#98316
A
Finishing the work
B
Had finished the work
C
After finished the work
D
Having finished the work
The amount of money _______for the seriously sick child was soon collected.
#98155
A
to need
B
needed
C
needing
D
which needed
from endless homework on weekends, the stuclents now find their own activities to enjoy.
#96546
A
Freed
B
Freeing
C
To free
D
Having freed