题目内容

The doctor could ______ by the symptom that the patient caught flu.
A.observeB.sayC.tellD.speak
C
词义辨析题。A. observe 观察   B. say 说  C. tell 分辨   D. speak 说 句意:医生可以通过症状辨别病人得了流感。 根据语境选C
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