Why did she steal things_____she could easily afford to buy them?

问题描述:

Why did she steal things_____she could easily afford to buy them?
A.when B.since C.in case D.so that
如果B解释成“既然”的意思不是比A更合适吗?
而且在第四版牛津高阶字典里when可用since解释,为什么这题选A不选B?
可是用since也没有什么语法错误啊
2楼。since也可以解释为既然

when可以用许多时态,一般现在时,现在进行时,过去进行时..都可以.
这个强调同时,如:I was watching TV when my mother came.当我妈妈进来时我正在看电视.强调同时进行,当我"正在"干什么,我妈妈怎么怎么了.
我想应该是when更能强调她偷东西的那个时候是有能力支付的,但是还要偷东西,(重点是强调她偷东西时有能力)