1.选B
以下为英语中表倍数的几种常见用法：
(1) 倍数 as...as (意思是“A是B的几倍”。)
I am twice as old as he.
我的年纪是他的两倍。
He earns twice as much as he used to.
他比往常多赚二倍的钱。
An ordinary subway train, approaching the station, can be twice as loud as the loudest jet.
发出的声音可能是喷射机的两倍。
(2) 倍数+比较级 (意思是：A是B的几倍)
This street is four times shorter than that one.
这条街道比那条短四倍。
The mother elephant is one hundred times heavier than the baby elephant.
这只母象比小象重一百倍。
It is ten times louder than another.
它比另外一个的声音大十倍。
This street is three times wider than that one.
这条街比那条街宽三倍。
(3)倍数+the 度量词 of...
The earth is 49 times the size of the moon.
地球的体积是月球的 49 倍。
This river is three times the depth of that one.
这条河深度是那条河的三倍。
下边也可看作是这种句式的变化：
The length of the road is four times what it was three years ago.
这条路的长度是三年前的 4 倍。
The price of the meat is twice what it was last year.
肉价是去年的两倍。
再举一个简单的例子
①This room is three times as large as that one.
②This room is three times larger than that one.
③This room is three times the size of that one.
2.B
only 后接动词不定式和现在分词都被用作结果状语。
1. only to do 的意思是“不料（却）……，结果（却）……", 表示一个没有料到的结果。
I hurried to the supermarket, only to find it was closed.
我匆忙赶到超市,不料它已经关门了。
He made a long speech only to show his foolishness.
他讲了一大通，结果只是显露了他的愚蠢。
I went to see him, only to learn that he had left the city the night before.
我去看他，不料听人家说他已经在前夜离开这个城市。
2. only doing 的意思是“结果就……",表示一个意料之中的结果。
He died, only leaving nothing but debts.
他死了，结果只留下了一身债务。
He dropped the plate, only breaking it into pieces.
盘子从他手中掉下来，结果摔成了碎片。
He aimed, fired, only bringing down a red-necked bird.
他瞄准，射击，结果打下了一只红颈鸟。
本题意在表达他上气不接下气地冲进房间里，结果却被告知他女友的死亡。显然是意料之外的结果。像你基础比较差的话就要尽早找个好点的英语老师进行系统学习，然后制定学习计划。听说奥威斯发展大厦29层不错，他们那里外教一对四一对八进行口语的训练中教老师一对一指导语法及词性的学习。你可以到那里去试试！
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