Question

What he says and what he does _____. A. is not agree B. are not agree C. does not agree D. do not a

Answer 1

选D
考主谓一致的。
先排除A和B两个答案，因为都是系动词加实意动词构成的语法中的典型错误----两个动词无缘无故放在一起，没有构成任何正确的时态和语态。
what
he
says
and
what
he
does两个主语从句作并列主语，但并非同一物、事、或人，因此为复数概念，所以选D.

Answer 2

What
he
says
and
what
he
does
是由and并列的两个主语从句，由and,
both...and并列的两个名词或代词作主语，除非指的是同一人，要不就是复数。先排除A.和C。然后选D.固定搭配。表言行一致。