If we_________ sunlight_________ a dry leaf with a piece of glass, it may start burning. A.work; out...
2023-01-01 19:17:55 28次 2014届福建省四地六校高一下学期第三次月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
If we_________ sunlight_________ a dry leaf
with a piece of glass, it may start burning.
A.work; out B.
carry; out C. focus; on D.
concentrate; on
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