I have heard these sons and daughters say they never fully appreciated their parents _____ it was too late to
tell them.

A. as
B. that
C. until
D. when
C
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科目：高中英語 來源：期末題 題型：單選題

I have heard these sons and daughters say they never fully appreciated their parents _____ it was too late to
tell them.
[     ]
A. as
B. that
C. until
D. when

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