It may be necessary to stop（ ）in the learning process and go back to the difficult points in the lessons.
A.at a distance B.at intervals C.at case D.at length
有疑问？点此联系我们
收藏该题
查看答案
It may be necessary to stop（ ）in the learning process and go back to the difficult points in the lessons.
Tom’s friends have always been ___.
The poor girl couldn’t（ ）from her tears any more when her mother showed up.
Before an amendment can be added to the Constitution, it must be ratified by three-fourths of the state legislatures.
The story was said to ______ on the information from a reliable source.
Electric eels use charges to ______ prey and also stun them before they eat them.