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80. 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) a condition when it is present and indicate that there is one (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 andindicate its presence 这题答案选C没有问题,可是A为什么不对呢OG的解释是There is one leaves it in the final clause without a referent.为什么C的It没有问题,A的it就不行呢? |
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