Who told you about Dad’s illness?- The doctor A. in vainB. in turnC. by lawD. in c

--- Who told you about Dad’s illness? --- The doctor ．
A. in vain
B. in turn
C. by law
D. in charge

A. in vainB. in turnC. by law(答案→)D. in charge解析：考查短语辨析。in vain 白辛苦，in turn 反过来，by law 按照法律，in charge 负责管理，句意：谁告诉你父亲生病了?是对父亲负责的医生。所以选D。

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