问题补充：
he realized it was too late to return home.
A. No sooner it grew dark than
B. Hardly did it grow dark when
C. It was not until dark that
D. It was until dark that
答案：
A. No sooner it grew dark than
B. Hardly did it grow dark when
(答案→)C. It was not until dark that
D. It was until dark that
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