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问题: 简单的高中英语语法题

The shopkeeper did not want to sell for ___he thought was not enough. 填what为什么不填which

解答:

which引导定语从句,其前必须有先行词,如用which,应改成sell for the shoes which he thought was not enough.
而what引导宾语从句,做for的宾语,在从句中做主语。