英语语法高手请进！
than 比较级。比较的对象是一致的。这里是increase
it指代的是这个increase.
than后面是一句句子。it则是这边的主语故一定存在不然就是破句了
至于你说的。你看到过to did 这种东西么。介词后面跟动词原形好嘛。to do.
如果这边强改to do 也是可以的。但是会更别扭，需要你把后面的补出来才能知道怎么改。但是英语一般是强调简洁明了。实际上你是遇不到这么多从句的。所以这边直接it did with 有指代和简化的作用。同时也更明确了比较对象
答案：B
解释：
1. 楼主正解：句子主语the two students和非谓语动词lose之间的确是被动关系，即the two students be lost，所以必须选用其过去分词lost做状语。
2. 逗号前面并不是一个句子，而只是一个状语。
此句是用动词lose的非谓语形式lost所构成的短语做句子状语。
如果加上一个连词，则其必须变成相应的状语从句，当然的确可以把此从句的主语和be动词省略，这个现象就叫做状语从句的省略，有些人也称之为非谓语从句。
也就是说，你加个连词进去也可以，只是逗号前面不再只是一个状语，而是一个状语从句了。
3. 如果有having been lost，则此答案也可以。但因为是单选题，没有那个出题者会把两个正确的答案放在一起的。
having been lost称之为现在分词losing的被动结构的完成形式。
4. 不过对于lost这样形容词化了的分词，并和句子主语构成“主语 + be + 分词形容词”此类关系时，其做状语时一般都只会单独做状语。
其实这里用不定式和动名词都是正确的。我个人倾向于用不定式：and began to clamb ...
但学过新概念第二册的同学知道，这句话来自本书。亚力山大，语言大师，会有错吗？
是的，没错，本来就是一个推敲问题嘛！
只不过这篇文章，编者的语法意图是教学动名词作动词的宾语，所以这个began后就用了climing了。
新概念英语二册：Lesson 92 Asking for trouble
It must have been about two in the morning when I returned home. I tried to wake up my wife by ringing the doorbell, but she was fast asleep, so I got a ladder from the shed in the garden, put it against the wall, and began climbing towards the bedroom window. I was almost there when a sarcastic voice below said, I don't think the windows need cleaning at this time of the night.I looked down and nearly fell off the ladder when I saw a policeman. I immediately regretted answering in the way I did, but I said, I enjoy cleaning windows at night.So do I, answered the policeman in the same tone. Excuse my interrupting you. I hate to interrupt a man when he's busy working, but would you mind coming with me to the station?Well, I'd prefer to stay here,I said.You see. I've forgotten my key.Your what? he called. My key, I shouted. Fortunately, the shouting woke up my wife who opened the window just as the policeman had started to climb towards me.
to climb
begin to do sth
climbing
其实两者都可以，我个人倾向不定式，to climb 不定式多表示即将开始的动作 有将来意义，动名词表示正在进行的动作，有现在意义。但这里是began的搭配，没有特别明显的区别的
这里应当用 climbing。began 意指后面的动作全部，指 climbing 动作开始。用动词不定式的话，指的是 began 去做某事。
用不定式。因为前后两者指的不是同一件事。
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