单选题 1.  By 1945, electronic equipment had become so complex ______ it was often too large to be convenient or too heavy to be portable.
【正确答案】 A
【答案解析】[考点] 词汇
本句的意思是“到1945年,电子设备已经变得很复杂,以至于它太大了不很方便或者它太沉了,不便于携带”。本题考查的是词汇so ... that引导的结果状语从句。