选择题_____ the door open.Don't push it.A.Pulling B.Pull C.To pul 答案是选B,A和C为什么不对呢?

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选择题_____ the door open.Don't push it.A.Pulling B.Pull C.To pul 答案是选B,A和C为什么不对呢?
选择题_____ the door open.Don't push it.A.Pulling B.Pull C.To pul 答案是选B,A和C为什么不对呢?

选择题_____ the door open.Don't push it.A.Pulling B.Pull C.To pul 答案是选B,A和C为什么不对呢?
这是祈使句,要用动词原形开头.