Thesetwoalarmclocksarenormallysettogether,butnowtheyhavebeenresetafewhours_________.
C
but 表示前后句子意思是相反的，所以前面说了 set together，后面提到的就是 apart(分开)。
The other timing system belongs in our internal clocks，which，left ________，would tie the body to a 25-hour rhythm.
Theoldcouplehavebeenmarriedfor40yearsandneveronce_______witheachother.
The old couple have been married for 40 years and never once _______ with each other.
Bloomfield drew on ______ psychology when trying to define the meaning of linguistic forms.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.