（ ）Mary( )Sue knows nothing about the matter,( )they didn't go to school last FridayA.Either;or;becauseB.Both;and;asC.Not only;but;for答案给的是C,为什么不能选B呢?
问题描述：
（ ）Mary( )Sue knows nothing about the matter,( )they didn't go to school last Friday
A.Either;or;because
B.Both;and;as
C.Not only;but;for
答案给的是C,为什么不能选B呢?
答
knows 显示主语为单数,如果选B,主语就是复数了
答
both ...and 后面要用复数形式 knows 是单三
答
Not only.but(also)连接主语,谓语采用就近原则,在这也就是与Sue保持一致,因此动词是三单形式knows.
而both.and连接主语,视为复数,因此应该是know
答
用B的话后面的动词know就不能加S了，至于后面的because ,as 都可以的