A bone marrow test, (what) (involves) extracting fluid from the marrow, (maybe)

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问题 A bone marrow test, (what) (involves) extracting fluid from the marrow, (maybe) necessary (for diagnosing) leukemia.

选项 A、what
B、involves
C、maybe
D、for diagnosing

答案 A

解析 what不引导定语从句。引导非限制性定语从句应用which。改“what”为“which”。

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