The old couple have been married for 40 years and never once _______ with each other.
C
本题考查的是倒装结构的用法。第二分句中因有否定副词never提前，故应用倒装结构;第一分句中的havebeenmarried已限定了时态，据此可排除D项。
______ of a sentence depends on the context in which the sentence is uttered.
_______forthefreeticket,Iwouldnothavegonetoseefilmsooften.
There is a growing body of evidence to support the fact that most people suffer from a lack of daydreaming _______ an excess of it.
Children have a natural ________ about the world around them.