1.A 原因：在一些短語,如 many a 或 more than one 所修飾的詞作主語時,謂語動詞多用單數(shù)形式.但由more than… of 作主語時,動詞應與其后的名詞或代詞保持一致.
Many a person has read the novel.許多人都讀過這本書.
More than 60 percent of the students are from the city.百分之六十多的學生都來自這個城市.
2.B 原因：由or,either...or...,neither...nor...,not only...but also...,not...but...等連接并列主語時,謂語動詞的數(shù)通常遵循“就近一致”的原則,即謂語動詞的單、復數(shù)形式依最接近它的主語而定.特別要注意疑問句中謂語動詞的形式.如:
Either her father or her mother calls for her every afternoon.
－ Are either you or he to go there
－ Neither is.
Neither the president of the company nor the sales manager is a college graduate.
3.B 原因：一些以-ics結尾的學科名詞,如mathematics /politics / physics以及news/works(工廠)/means等在形式上似乎是名詞的復數(shù)形式,但多用作單數(shù)名詞,此類名詞作主語時,謂語動詞一般使用單數(shù)形式.如:
The paper works was built in 1990.
Every possible means has been used to prevent the air pollution,but the sky is still not clear.