I bought a birthday present_____Mark.理由

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Iboughtabirthdaypresent_____Mark.理由Iboughtabirthdaypresent_____Mark.理由Iboughtabirthdaypresent_____Ma

I bought a birthday present_____Mark.理由
I bought a birthday present_____Mark.理由

I bought a birthday present_____Mark.理由
for :为了.译：我为马克买了一份生日礼物

for
for ...表示给谁的

bought for给谁的。