I'm SORRY to tell you that I _____ on the play ground..A.forget your books B.forgot your books behindC.have left your books alone D.left your books behind

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I'm SORRY to tell you that I _____ on the play ground.
.
A.forget your books B.forgot your books behind
C.have left your books alone D.left your books behind

D
leave alone不打扰不干涉离开
leave behind留下,忘记携带