Many experiments have been done to ___ their purpose.
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Many experiments have been done to ___ their purpose.
a、achieve
b、teach
c、prove
d、make
a、achieve
b、teach
c、prove
d、make
A.achieve 意思是“实现”
译为:为了实现他们的目的,他们已经做了许多试验.
译为:为了实现他们的目的,他们已经做了许多试验.
Many experiments have been done to ___ their purpose.
have been done 和 to be done
Experiments have already been done in this field ,but only _
Many e___ have been done to find out medicine to deal with s
done,tobe done,to have been done,to have done,having done,ha
to have been done 和having been done
much has/many have been done to stop the pollution.请说明选A原因
( )have people done to their environment?
有没有have to been done
to have been done 怎么用
to have been done结构怎么用
To.have.been.done应该怎么翻译