求问OG2019 SC 692的while的用法呀 请SC大神们快来帮帮我

VanessaLin11

The Commerce Department reported that the nation’s economy grew at a brisk annual pace of 3.7 percent in the second quarter, but that while businesses were expanding their production, unsold goods piled up on store shelves as consumer spending is slowed sharply.

A. unsold goods piled up on store shelves as consumer spending is slowed sharply

B. unsold goods were piling up on store shelves as consumer spending slowed sharply

C. unsold goods had piled up on store shelves with a sharp slowing of consumer spending

D. consumer spending was slowing sharply, with the piling up of unsold goods on store shelves

E. consumer spending has slowed sharply, with unsold goods piling up on store shelves

正确答案是B

我能理解解析和句意，但是这题的while用法突然让我有点困惑为什么but that while businesses were expanding their production 后面直接接上另一个ing形式 unsold goods were piling up on store shelves as consumer spending slowed sharply

呢？

我们了解到的while表同时性接延续性动词时一般都说主将从现ect.  比如 While I was cooking in the kitchen, my husband came back home.

但是这题似乎while连接两个同时发生的动作且用逗号隔开，不知道这是怎么理解？

或者要理解为：while+第一个完整句子，第二个主句又套了一个as连接的从句（在这个从句中as引导主将从现这个规则）？

即：while businesses were expanding their production, unsold goods were piling up on store shelves as consumer spending slowed sharply.

求大神指教呀～～万分感谢！！

leonlo

这题貌似没有考while 的用法