C
这是强调结构句,强调的是原句的介词at 的宾语the color of the material ,故用which(也可以是that---更常见)
还原:
He was surprised at the color of the material .
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C
这是强调结构句,强调的是原句的介词at 的宾语the color of the material ,故用which(也可以是that---更常见)
还原:
He was surprised at the color of the material .
很高兴为您解答,fightout为您答疑解惑
如果本题有什么不明白可以追问,