【B1】 [br] 【B3】A、whatB、whenC、whichAand what they are made of?“他们是用什么做的?”what 即

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问题【B1】 [br] 【B3】

选项 A、what
B、when
C、which

答案 A

解析 and what they are made of?“他们是用什么做的?”what 即是宾语从句的引导词，又是从句be made of 的宾语。

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