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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(gè)句子之間沒有并列連詞 and，故可排除 A 和 D；又因?yàn)?/FONT> what 不能用于引導(dǎo)定語從句，所以 most of what 也可排除。此處的 most of which 相當(dāng)于 and most of them，所以若在選項(xiàng) A 的前加上 and，則也是對的。