.
.______ many times ,I finally comprehended it .
A Told B Having told C Telling D Having been told
---What happened to the house ?
---It_____burnt to the ground.
A is said to having been B. is supposed to have been
C is reported to have been D. is believed to have
---You must obey every word of mine!
---_______ I don’t?
| A．How if | B．What if | C．Even if | D．Only if |
How long do you think it will be _______ China sends another manned spaceship to the moon?
| A．when | B．until | C．that | D．before |
---________by the chemistry teacher for not finishing homework independently makes him feel very shameful.
---Yes. But he told me this morning he would spare no efforts to be the top one in our class.
| A．Scolded | B．Having scolded |
| C．Being scolded | D．After being scolded |
So absorbed ________ in the research that she didn’t hear someone knocking at the door.
| A．she did | B．did she | C．she was | D．was she |