—How long did you do your homework? —.A. Before it struck 10B. Since supper timeC. So long

问题补充：

—How long did you do your homework? —.

A. Before it struck 10

B. Since supper time

C. So long as I stayed up

D. Until 10 o’clock

答案：

A. Before it struck 10

B. Since supper time

C. So long as I stayed up

(答案→)D. Until 10 o’clock

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