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题库 / OG2016V-SC-87
Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.
a condition when it is present and indicate that there is one
when a condition is present and indicate that there is one
a condition when it is present and indicate that it is present
when a condition is present and indicate its presence
the presence of a condition when it is there and indicate its presence
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C Correct. The three uses of the pronoun it refer clearly to condition, and
the two parts of the sentence correspond.
D When a condition is present emphasizes the time of the detection rather
than the condition itself. The final it has no referent.
E Presence illogically repeats the same idea as when it is there. The final it
has no referent.
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