英语语法问题请帮我解答问题,谢谢1.They must have been enjoying themselves th

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英语语法问题
请帮我解答问题,谢谢
1.They must have been enjoying themselves there, otherwise they _________ so long.
A.can't have stayed B.wouldn't have stayed C.needn't have stayed D.couldn't stay
答案：B,wouldn't have stayed,为什么?
2. To their great fear, they found _________ in the heaviest snowfall they had ever had.
A.they were catching B.themselves caught C.they had caught D.themselves catching
答案：B,themselves caught 为什么答案是B
3. I am very disappointed when I ________ saw him.
A.lastly B.the last C.last D.late
答案：C. last,为什么

1. 这个题考察的是虚拟语气.otherwise,否则,是表示虚拟语气的一个经常常出现的提示词汇.否则的话他们不会已经在那里停留了这么长时间.事实上他们已经在那里停留了好长时间.虚拟语气,没有用can't, needn't之类的词,所以A.C不对.另外根据句意,肯定是“已经”.所以D也不对.
2. 他们发现“被困”在大雪里面,过去分词才能表示被动,所以A.D不对,另外,C,如果改成they had been caught就对了.
B.=(that) they have been caught.
用B时简单句,用以上相等成分是复合句.
另：看下句帮助你理
i find (that) it is easy to learn english. 复合句
=i find it easy to learn english. 简单句 to learn english作it的补语.
3. last:同时具有形容词和副词的词性.
这句话是上次见到的意思,所以ABD都不对.
另外,你原句写的可能有点问题,am应该是was, 笔误?呵呵
i was very dissapointed when i last saw him.
因为时间和条件状语从句都遵循"主将从现,主现从现,主过从过"的原则.

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