It is not hard to find the truth ;what is hard is not to run away from it （）you have found it.
A、
while
B、
once
C、
as long as
D、
as soon as
【正确答案】：B
【题目解析】：
找到真理并不难，难的是一旦发现真理就不要逃避。once一旦···，符合句意。while当···；as long as只要；as soon as一···就···。
It is not hard to find the truth ;what is hard is not to run away from it （）you have found it.
It is not hard to find the truth ;what is hard is not to run away from it （）you have found it.
while
once
as long as
as soon as
找到真理并不难，难的是一旦发现真理就不要逃避。once一旦···，符合句意。while当···；as long as只要；as soon as一···就···。