大全551

tangyu84

Once positioned in space, the Hubble Space Telescope will capture light from sources twenty times fainter compared to those that can be detected by ground-based instruments.

(A) compared to those that can be detected

(B) compared to those they can detect

(C) than that can be detected

(D) than those that can be detected（D）

(E) than those detecting

答案是D,没有问题. 我想问 : D中的that是指代those吧, 那把(D)中的that省略 改成 than those can be detected对吗?

bobiouou

than those can be detected

对的

我有另外一个问题

light不可数为什么用those？而不用that？

you5460

完整句子: the Hubble Space Telescope will capture light from sources (that are) twenty times fainter than (the Hubble Space Telescope will capture light from) those that can be detected by ground-based instruments.

现在就很明确those指代什么了