单选题

Doctors have to be very careful when making a ___.

Atreatment

Bsymptom

Cdiagnosis

Dpatient

本题考查词语含义，题目意为“医生在作出诊断时要格外小心。”空格前有a，应填可数名词单数形式。A项意为“治疗，诊治”。B项意为“症状，征兆”。C项意为“诊断”。D项意为“病人，患者”，从语意上排除B和D。A项当作“处理、治疗、对待”时，为不可数名词；而作为“疗法，处理方法”时，为可数名词。

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