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雷达卡
Unit5 Nelson MandelaPeroid 5 Grammar The Attributive Clause Ⅱ
关系代词使用方法
关系代词在从句中能够：
whom
who
which
that
whose
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
何时能够省略？
做宾语时能够省略
The Attributive Clause 2--Relative Adverbs
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