Bell and Watson had everything set for their first test of the invention.
贝尔和华生为第一次测试他们的发明做好了一切准备。
When the bell rang, he could hardly finish his test paper.
他还未做完试卷，下课铃就响了。
Hardly could he finish his test paper when the school bell rang.
他还未做完试卷，下课铃就响了。
Hardly could he finish his test paper when the school bell rang.
他还未做完试卷，下课铃就响了。
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