单选题Which of the following is the best version of sentence 2 (reproduced below)?The medical community doesn't know the cause, has difficulty diagnosing it, and it is hard to test.AThe medical community does not know the cause of the disease, has difficulty diagnosing it, and cannot test for it.BBecause the medical community does not know the cause, they cannot diagnose or test for it.CThe medical community does not know the cause and has difficulty diagnosing it, so it is hard to test.DThe medical community does not know the cause, diagnosis, or test.EAdditionally, the medical community cannot cause, diagnose, or test for the disease.
单选题
Which of the following is the best version of sentence 2 (reproduced below)?The medical community doesn't know the cause, has difficulty diagnosing it, and it is hard to test.
A
The medical community does not know the cause of the disease, has difficulty diagnosing it, and cannot test for it.
B
Because the medical community does not know the cause, they cannot diagnose or test for it.
C
The medical community does not know the cause and has difficulty diagnosing it, so it is hard to test.
D
The medical community does not know the cause, diagnosis, or test.
E
Additionally, the medical community cannot cause, diagnose, or test for the disease.
参考解析
解析：
B，C，D项改变了句子的意思。C项中的“it”指代模糊。A项句子最为简洁且表意最清晰。
B，C，D项改变了句子的意思。C项中的“it”指代模糊。A项句子最为简洁且表意最清晰。
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