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问题: 英语高手请进

On stepping into his room he was astonished to find the floor covered with ____ looked like very tiny insects.
A that B something C what D anything
为什么不选B?

解答:

选C.

如果选B,则后面的定语从句looked like very tiny insects,必须有关系代词that,因为关系代词作主语时不能省。

因此本题选C what,这里what相当于something that. 老外把这种情况称为名义定语从句,关系代词what具有双重功能,既是先行词(something),又是关系代词(that).