单项选择题

  There once was a master who came to India,perhaps from Persia.When he got there,he saw a lot of(1).In India they have plenty of fruit to sell,but much of it is expecsive.So he saw a big basket of some very red,long fruit to sell,but much of it is expensive.So he saw a big badket of some very reed,long fruit,the cheapest in the shop.He bought a whole kilogram of the fruit and started(2)it.But after he ate some of it,his eyes and mouth(3)and burned,and his face became red.He soughted and chokede,jumping up and down.
  But he still contnued to eat teb fruit! Some peple who were(4)him said,"Those are hot pepper!People use them(6)that;they're not fruit!"But the stupid master said,"No,I can't stop!I(7)money for them,and now I'll eat them.It's my money!"
  And you think that master was stupid,right?(8),we sometimes do a lot of things like that.We invest money,time or effort in a relationship,business or job.Even though bitter experience tells us it won't work,we still continue just(9)we've invested money,time,effort and love into it.Just like the man who ate the peppers and(10)so much but couldn't stop because he didn't want to waste the money he'd paid.
 

 

we still continue just()we've invested money.

A.when
B.if
C.since
D.because