—Why didn’t you stop the ball? —________ I could catch it, a boy from Class Three

—Why didn’t you stop the ball?

—________ I could catch it, a boy from Class Three suddenly appeared and caught it.

　　A. Until

　　B. When

　　C. After

　　D. Before

答案

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—Why didn’t you stop the ball? —________ I could catch it, a boy from Class Three

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