What is behind that tree -There must be a dog _ beside it.A.sit B.sat C.to sit D.sitting dont _____ it,It may be difficult,but it is useful!A.drop B.fall C.go D.stop

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What is behind that tree -There must be a dog _ beside it.A.sit B.sat C.to sit D.sitting dont _____ it,It may be difficult,but it is useful!A.drop B.fall C.go D.stop
What is behind that tree -There must be a dog _ beside it.A.sit B.sat C.to sit D.sitting
dont _____ it,It may be difficult,but it is useful!A.drop B.fall C.go D.stop

What is behind that tree -There must be a dog _ beside it.A.sit B.sat C.to sit D.sitting dont _____ it,It may be difficult,but it is useful!A.drop B.fall C.go D.stop
D sitting beside it 是dog的定语,it 代指树,说明狗在树旁的那种状态,不能用to sit ,A B 明显不对
A drop 有放弃的意思,适合语意

D 前面有be动词,后面动词用ing形式
A drop意为“使……落下”;fall意为“落下”;空后有it



望采纳,不懂可追问

第一个d .表现在的状态所以用现在分词
第二个a .意思是落下,放弃,停止,