Being a doctor is one of the few professions＿＿＿＿if you make a mistake，it can mean somebody's life．
A．thatB．whichC．whenD．where
D

試題分析：此處the few professions是先行詞，其在定語從句中作地點(diǎn)狀語，故用where。這里相當(dāng)于in the few profession. 句意：當(dāng)醫(yī)生是如果出錯(cuò)就出人命的幾種職業(yè)之一。
考點(diǎn)：
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