________scores of times, but Derek still couldn’t understand how to use past participle in a concrete situation.
| A．Having explained | B．Having been explained |
| C．Though it was explained | D．It was explained |
___ the invention of the steam engine, the industrial revolution played a vital role in human history．
| A．Originating in | B．Originated in |
| C．To originate in | D．Being originated in |
Blog, a shared on line journal where people can post diary entries about their personal experience and
hobbies, ___ more and more popular with people of all ages．
| A．becomes | B．become |
| C．becoming | D．is becoming |
My car’s performance is ___ since the engine’s been tuned and the tires have been changed．
| A．better as twice | B．twice as the condition |
| C．twice as good | D．twice as better |
He ___ away before we arrived, since the house was deserted．
| A．shall have gone | B．should have gone |
| C．could have gone | D．must have gone |
When we happy for what we win, we should keep in mind that one’s good vintage may be ___ bitter cup．
| A．the other’s | B．another’s | C．other’s | D．other else’s |