问题
选择题
We were just about ready to leave _____ it started to snow.
A．when
B．before
C．after
D．since
答案
答案：A
when 在此用作并列连词，意为“这时（突然）”。
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We were just about ready to leave _____ it started to snow.
A．when
B．before
C．after
D．since
答案：A
when 在此用作并列连词，意为“这时（突然）”。