With an appropriate relative pronoun or relative adverb: The treatment,_______ is being tried by doctors at these hospitals, has

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问题 With an appropriate relative pronoun or relative adverb:
The treatment,_______ is being tried by doctors at these hospitals, has proved to be effective for patients.

选项

答案which

解析 本句是由which引导的非限制性关系分句,需填的关系代词指代The treatment。答案为which。
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