after several long moments,a small hand slowly went up,（ ）back down,and then went up again.after several long moments,a small hand slowly went up,（ ）back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold

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afterseverallongmoments,asmallhandslowlywentup,（）backdown,andthenwentupagain.afterseverallongmoments

after several long moments,a small hand slowly went up,（ ）back down,and then went up again.after several long moments,a small hand slowly went up,（ ）back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold
after several long moments,a small hand slowly went up,（ ）back down,and then went up again.
after several long moments,a small hand slowly went up,（ ）back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold down 不是有退缩吗》

after several long moments,a small hand slowly went up,（ ）back down,and then went up again.after several long moments,a small hand slowly went up,（ ）back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold
hold这个词是个控制性的动作,意思是保持、掌控.hold不住这个知名网词意思是掌控不住嘛.hold down的意思是压住、抑制,而不是放下来.
drop这个词本身就表示下降,所以drop down就是掉下来,放下来的意思.

I'm really t_ after a long walk I'm sure he will be back __.just wait a minute.A.long before B.before long C.after long D.long after 托福TPO求助句子分析,The desert sections of long river respnd several months after rain has fallen outside the desert. after a long long-sought-after see you after several months 的意思 请问several inches long.是什么结构,long是什么词性? after several long moments,a small hand slowly went up,（ ）back down,and then went up again.after several long moments,a small hand slowly went up,（ ）back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold 英语作文 some schools or universities have cancelled long distance races due to several students sudden deaths across China after long distance race.发表你的看法,60词, A:Long time no see What( )you( )after you leave school B:I'm a policemen I'm k______of tired after a long walk.I want to have a rest. long after和after long 的区别是啥 l'm tired after a long walk .i'd like to l to music for a m( ) . 对 several hours 提问用how soon 还是how long? several several several several