—Sorry. I ________ to post the letter for you. —Never mind. ________ it myself after school.A.forget; I’d rather postB.forgot; I’ll postC.forgot; I’m going to postD.forget; I’d better post
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B解析由道歉可知，当时“忘记”帮对方寄信了，forget应发生在过去；“放学后自己去寄”是临时的决定，只能用will而不能用表示计划或打算的be going to。