6.(NMET 2002, 34) The research is so designed that once _______ nothing can be done to change it.

A.begins B.having begun

C.beginning D.begun

5.(NMET 2002, 32) Having a trip abroad is certainly good for the old couple, but it remains _______ whether they will enjoy it.

A.to see B.to be seen

C.seeing D.seen

4.(2003上海春季, 38) She will tell us why she feels so strongly that each of us has a role _______ in making the earth a better place to live.

A.to have played B.to play

C.to be played D.to be playing

3.(2003上海春季, 37) Unless _______ to speak, you should remain silent at the conference.

A.invited B.inviting

C.being invited D.having invited

2.(2003上海春季, 36) _______ the meeting himself gave them a great deal of encouragement.

A.The president will attend B.The president to attend

C.The president attended D.The president's attending

1.(2003上海春季, 35) Friendship is like money: easier made than _______.

A.kept B.to be kept C.keeping D.being kept

8.答案:C

解析:as if引导的从句常用虚拟语气.表示现在用一般过去时,如果是动词be,无论主语是单数还是复数一律用were.表示过去用过去完成时;表示将来用过去将来时.

试题十二 非谓语动词

7.答案:D

解析:otherwise否则,说明事情没有发生过.由此可判断出要用虚拟语气(might have said sth.).昨天珍在讨论中间离开了.否则她将可能说一些她以后会后悔的话.

6.答案:C

解析:根据主句的谓语动词would have happened,可以断定要用虚拟语气中.当条件状语从句中的if省略时,要倒装.如果鲍勃走得远一点,走到岸边,会发生什么事呢

5.答案:D

解析: otherwise常与虚拟语气连用,表示过去发生的事要用would have scored.在踢球前他犹豫了一会儿,否则他就会射中球门.