those series of 后面谓语动词用复数,a series of 后面用单数.
例子:
( )16Those series of stamps ______ incomplete,while this series ______ complete.
A.are;are B.is;is
C.are;is D.is;are
答案:C
series的用法同means,这类词的单复数是同形的,从词形上看是复数形式.谓语动词的单复数形式要根据句子的具体含义来定.
如:Every means has been tried.每种方法都试过了.
All means are unpleasant.所有的方法都不太令人满意.