The treatment must continue until this patient reaches the point when he can walk flexibly.

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问题 The treatment must continue until this patient reaches the point when he can walk flexibly.

选项 A、where
B、which
C、that
D、whose

答案A

解析 这句话的意思为:治疗必须持续到患者能够灵活行走的程度。此题中的从句“he can walk flexibly”中缺少状语,所以只能选关系副词作为定语从句中的引导词。答案为A。
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