Even though he was guilty ,the ( )judge did not send him to prison

Even though he was guilty ,the ( )judge did not send him to prison
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A.merciful
B.impartial

为什么选A?
B哪里不对?

He ___your more help,even though he was very busy. even though和though even though he is but a passing acquaintance even if 与even though although though even though 的区别？ 关于even if和 even though despite 和even though athough even though的区别 Even though African game preserves ...... although, though, even though在语法上有什么区别 请问大家even if ,even though的区别