Since most doctors are ______ about effectiveness of the new medicine, they seldom recommend it to their patients.

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问题 Since most doctors are ______ about effectiveness of the new medicine, they seldom recommend it to their patients.

选项 A、anxious
B、dubious
C、cynical
D、innocent

答案B

解析句意为“由于大多数医生对于新药的药效不是很确定，所以他们很少将其推荐给病人。”dubious可疑，不确定性，符合此意；anxious紧张；cynical愤世嫉俗的；innocent无罪的，清白的。

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