Why didn’t you try to finish the composition? I tried to, but ______ I could, the bell rang announcing the end of the examination time. A. until B. when C. before D. after

Why didn’t you try to finish the composition? I tried to, but ______ I could, the bell rang announcing the end of the examination time.
A. until
B. when
C. before
D. after

出自：中北大学-大学英语1

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