【题目】To her joy,Della earned first the trust of her students and of her collegues.
A.that
B.one
C.ones
D.those

【答案】A
【解析】句意：令她高兴的是，德拉首先赢得了她的学生的信任，还有同事的信任。此处填that，代替前文的the trust，one应代替a +单数可数名词；ones代替前文的可数名词复数；those代替前文的the +可数名词复数。