Theoldcouplehavebeenmarriedfor40yearsandneveronce_______witheachother.
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 have been married 已限定了时态，据此可排除 D 项。
Modern English words man, woman, child, eat, fight, etc, originate from ______.
Theothertimingsystembelongsinourinternalclocks，which，left________，wouldtiethebodytoa25-hourrhythm.
We ________ go out to restaurants, but mostly we eat at home.
______ of a sentence depends on the context in which the sentence is uttered.