It a Saturday afternoon in May Margaret could arrange for me to meet her elder sister.
A. was until, when
B. was until; that
C. was not until, when
D. was not until; that
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A. was until, when
B. was until; that
C. was not until, when
(答案→)D. was not until; that
解析：考查强调句。本题考查not … until …与强调句的连用，构成It is / was not until + 从句+ that +主句结构，故选D。