Question

【题目】一 Be careful, ________ you will make mistakes in your exams.
— I know that, Mum. One can never be too careful.
A.and
B.or
C.nor
D.but

Answer 1

【答案】B
【解析】句意：——认真点，否则你在考试中会犯错误的。——我知道，妈妈。一个人再小心也不过分。句型：祈使句+and/or+陈述句；and表因果；or否则，表示转折。故选B。