I can well remember that there was a time a deep blue sky, the song of the birds, moonlight and flowers could never have kept me spellbound.
A. which
B. where
C. when
D. that
网友回答
A. which
B. where
(答案→)C. when
D. that
解析：考查固定搭配 题意为 我仍然能够清楚的记得曾经有一段时间，蓝蓝的天空，美妙的小鸟叫声，夜光，花朵使我难忘。There was a time when，曾有一段这样的时光。
考点 固定句型。