题目
1. 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，解释说是those 指代sources
我当时选的是C，认为faint修饰的是light，所以后面也是light can be detected
我的疑问，比较对象不是很清楚，觉得比较的是light不是source
谢谢大家的帮助 | 
