-------------------（检查）your homework before handing it in .(check)

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-------------------（检查）yourhomeworkbeforehandingitin.(check)-------------------（检查）yourhomeworkbefor

-------------------（检查）your homework before handing it in .(check)
-------------------（检查）your homework before handing it in .(check)

-------------------（检查）your homework before handing it in .(check)
Check---（检查）your homework before handing it in .(check)
祈使句用动词原形

check