摘要： Having down the heavy burden, he down on the ground to relax. A. laid; lay B. lay; laid C. lain; laid D. lain; lay

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Having down the heavy burden, he down on the ground to relax．

Having ________ down the heavy burden, he ________ down on the ground to relax．

laid; lay

lay; laid

lain; laid

lain; lay

Having ________ down the heavy burden, he ________ down on the ground to relax．