18.- Have you found Jennifer yet - No ,we still have no ____ as to where she went after she left home .
问题描述：
18.- Have you found Jennifer yet - No ,we still have no ____ as to where she went after she left home .
A.proof B.reason C.clue D.cause
,不用该用复数clues吗?
答
no +单数或复数,clue是可数名词,所以可用
在这四个选项中只能选C,