The newly developed skin tests may be used in the future to allow doctors to ______. The last paragraph implies that diagnostic

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问题 The newly developed skin tests may be used in the future to allow doctors to ______.
The last paragraph implies that diagnostic test ______.

选项 A、will not be as promising as others
B、is a very important development
C、may not be proven valid smoothly
D、will surely be disappointing in the end

答案C

解析 该题借助句意,利用排除法判断答案。
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