SAT 2007年10月一语法题求助（Because of pleading in vain for improved maintenance services ,the tenants refused） to pay rent until the landlord agreed to make the much-needed repairs.A.B.Having pleaded in vain for improved maintenance services ,the tenants refused为什不选A呢,AB都表示原因,为什么不选because of
问题描述：
SAT 2007年10月一语法题求助
（Because of pleading in vain for improved maintenance services ,the tenants refused） to pay rent until the landlord agreed to make the much-needed repairs.
A.
B.Having pleaded in vain for improved maintenance services ,the tenants refused
为什不选A呢,AB都表示原因,为什么不选because of
答
B.表示的是时间=After they pleaded in vain for .,A.Because of (doing) sth.表示原因.因为(做了）某事...租客拒绝交租金不是因为他们恳求...,而是因为他们的恳求无效.如表示这个意思,可能Pleading in vain for .或...