几个定语从句的1 The reason

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D that,that,首先The reason____he gave 是定语从句,reason在从句中做宾语,所以用that而不用why.而后句是表语从句,引导词只能用that.句型为the reason is that.
A what;which.what it was,what做was的宾语,后句是which引导的非限定性定语从句
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供参考答案1:
D B供参考答案2:
D A 对的