一个独立主格 The bus was crowded with passengers going home from market,most of ________

问题描述:

一个独立主格 The bus was crowded with passengers going home from market,most of ________
The bus was crowded with passengers going home from market,most of ________ carrying heavy bags and baskets full of fruit and vegetables they had bought there.
A.them B.who C.whom D.which
most of them carrying...为独立主格结构,相当于 and most of them were carrying...,也可改为:most of whom were carrying.
我是想问 为什么相当于and most of them were carrying..,这个were carrying 是表示过去进行时?were 是什么用法 那前面也没交代是进行时啊

这里是表示过去进行时.如果用过去时就没办法用独立主格结构,用过去时为 and most of them carried 独立主格结构中省去的是be动词 想表达整句话的意思 用 were carrying 或者carried 都对,但是用独立主格结构就得用题中的形式从哪看出是过去进行时了?前面的 was 和 going吗was 是因为be crowded with 而存在,going应该是表示“将要回家”,知道题目是独立主格结构 ,自然知道省略的是be 动词,be doing 不就是表示正在进行吗?
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