most of them還是most of which

請看看下面這道題，答案是 most of them 還是 most of which：

The growing speed of a plant is influenced by a number of factors, ______ are beyond our control.

A. most of them       B. most of which       C. most of what       D. most of that

【分析】答案為B。由于兩個句子之間沒有并列連詞 and，故可排除 A 和 D；又因為 what 不能用于引導定語從句，所以 most of what 也可排除。此處的 most of which 相當于 and most of them，所以若在選項 A 的前加上 and，則也是對的。

比較：

Some managed to vote, but most of them didn’t. 有些人設法投票了，但多數人都沒有。

The buses, most of which were already full, were surrounded by an angry crowd.  公共汽車大多數都已經擠滿了人，它們被憤怒的人群包圍著。