When he saw the train moving ,he realized he could not get on it.( D)
A.heard B.achieved C.find D.understood
为什么要选 D ,C为什么不可以,
真不好意思:就打括号换单词
When he saw the train moving ,he (realized )he could not get on it.( D)
A.heard B.achieved C.find D.understood
括号里为什么要换成D,换成C不可以吗?