单选 The doctor tried his best（）the young man.①help②helps③helped④to help

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单选 The doctor tried his best（）the young man.①help②helps③helped④to help

单选 The doctor tried his best（）the young man.①help②helps③helped④to help
单选 The doctor tried his best（）the young man.
①help
②helps
③helped
④to help

单选 The doctor tried his best（）the young man.①help②helps③helped④to help
4 try one's best to do 尽全力.

②helps
一般现在时的第三人称