The treatment must continue until this patient reaches the point when
单选题The treatment must continue until this patient reaches the point when he can walk flexibly.
A.where
B.which
C.that
D.whose
参考答案：A
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答案解析：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。
