Question

【题目】________ you have a try, you will never know if you will succeed in doing it.
A.Unless
B.Because
C.Although
D.When

Answer 1

【答案】A
【解析】句意：除非你去试了，否则你永远不会知道你是否会成功。you will never know你永远不会知道……可知前一句是假定，故选A