20．—Though it is 30 years _____ we last met, I still remember the scene _____ we got separated on a rainy day.
| A．since; where | B．before; which | C．since; when | D．before; where |
Victor apologized for _________ to inform me of the change in the plane.
| A．his being not able | B．him not to be able |
| C．his not being able | D．him to be not able |
All the people present agreed that the matter required ___________.
| A．to look into | B．being looked into | C．to be looked | D．looking into |
For some time, Chinese people, under the leadership of CPC, ________ the contents of the Scientific Development Concept in the course of practicing socialism in China.
| A．had been improving | B．have been improving |
| C．were improving | D．improved |
He is afraid to face the difficulty he thinks he’ll have _________ the driving test tomorrow; he finds it difficult _________ rid of the worries.
| A．passed; got | B．passing; to get | C．to pass; getting | D．in passing; in getting |
Nick is looking for another job because he feels that nothing he does ______ his boss.
| A．serves | B．satisfies | C．promises | D．Supports |