__________ he took part in the competition, he won a second prize.
| A．The first time | B．For the first time |
| C．At a time | D．At one time |
杂集与其它
. Here we found only a little snow, as most of it seemed ________ blown off the mountain.
| A．to be | B．to have been | C．that it was | D．that it had been |
. It is on thing to accuse a person of a certain crime, but ________.
| A．to prove it is quite another matter | B．proving it is difficult |
| C．it is hard to prove | D．how to prove is difficult |
. I won’t make up with him ________ he apologizes.
| A．unless | B．lest | C．provided | D．whereas |
. While teaching students, teachers should take into consideration _________ students develop at different rates.
| A．the fact that | B．since | C．as long as | D．despite of |
. The thought worried him much ________ he might fail in the exam.
| A．that | B．which | C．when | D．so that |