The work entailed a number of expense which I had not allowed for.
为什么这句,后面which引导的定语从句,先行项只能认为是expense, 而不能认为是a number of expense 呢?
而在The work entailed a number of expense, which I had not allowed for. 先行项却只能认为是a number of expense, 而不能是expense呢?
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