各位大侠求解释啊 完全不知道为什么选C Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not. B) when a condition is present and indicate that there is one C) a condition when it is present and indicate that it is present D) when a condition is present and indicate its presence E) the presence of a condition when it is there and indicate its presence
各位大侠求解释啊 完全不知道为什么选C Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not. B) when a condition is present and indicate that there is one C) a condition when it is present and indicate that it is present D) when a condition is present and indicate its presence E) the presence of a condition when it is there and indicate its presence
-- by 会员 ychen34 (2011/12/31 9:28:51)
首先,detect是一个及物动词,要接宾语,所以可以排除BD。 然后E中it指代模糊,不知道指presence还是condition,放一边。 最后剩AC。AC的不同是indicate that 后面的那一部分。从未划线的when it is not可以看出,用it is present跟其平行。而不能用 there is one when it is not。因为,如果要用这个的话起码也是there is one when there is not这样。