旧prep1-77 关于比较的省略

weirui5621

77.(28689-!-item-!-188;#058&003708)

Scientists have found signs that moving water changed the chemical makeup of the surface of Mars in recent eras, therefore concluding that its crust is harboring up to three times as much water than was previously thought.

(A) eras, therefore concluding that its crust is harboring up to three times as much water than was

(B) eras, therefore concluding that the planet's crust harbors up to three times as much water or more as was

(C) eras and have therefore concluded that the planet's crust harbors up to three times as much water as

(D) eras and they have concluded, therefore, that its crust harbors up to three times as much water, or more, than

(E) eras and concluded, therefore, that the planet's crust is harboring up to three times more water as was

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问题：本题比较的两个对象都是its crust 第二个分句省略可以明白，可是为什么还可以省略B选项的was呢？
Previously不是用来提示用过去时间的吗？

eshopaholic

more than expected,  less than estimated,  greater than thought .... 习惯都是这样表达的。

此外，B的错误在于concluding.   分词形式在句末 表示伴随产生的结果，而显然found和concluded的发起者都是scientists，应该用 平行并列的结构

weirui5621

more than expected,  less than estimated,  greater than thought .... 习惯都是这样表达的。

此外，B的错误在于concluding.   分词形式在句末 表示伴随产生的结果，而显然found和concluded的发起者都是scientists，应该用 平行并列的结构

-- by 会员 eshopaholic (2010/10/26 13:52:17)

感谢LS 在请教一个问题
S V O, doing。。。的句型里，doing 的逻辑主语有以下几种情况：
1。doing做结果状语，整个句子是doing的主语
2。doing做伴随状语，修饰的那个动作的主语就是doing的逻辑主语
想问下，那doing的逻辑主语可以是宾语O吗？

weirui5621

more than expected,  less than estimated,  greater than thought .... 习惯都是这样表达的。

此外，B的错误在于concluding.   分词形式在句末 表示伴随产生的结果，而显然found和concluded的发起者都是scientists，应该用 平行并列的结构

-- by 会员 eshopaholic (2010/10/26 13:52:17)

还有一个问题 这里省略was的话时间上不会造成歧义吗？
明明是过去的时间 和主语的时态不一致啊

powers

c)不应该用harbored吗?

淮河侠

这题只需要观察选项的后部。

在比较中，more...as.. 和 as...than...都是错误的句式，A和E排除。
如果是表达 “大于或等于” ，可以使用 as....as...or more...than... 或者 at least as...as...句式。故B和D错误。

至于其他的差异，我都没去斟酌。如果楼主非要斟酌B选项的was，我真是不懂，还请指教。

geegee

as much ...as是正确的。
as previously thought, was 省略，
即the planet's crust was thought to be harbouring ...

爱吃巧克力

个人认为B的concluding没错，这里就是做结果状语啊，也同意二楼：”more than expected,  less than estimated,  greater than thought .... 习惯都是这样表达的“说法，was是应该被省略的