–Look at the dark clouds in the sky up! --Hurry up! Dark clouds are often _______ of the heavy rain....
2022-10-07 18:42:51 35次 湖北省武汉市广雅2017-2018学年八年级下学期周练（一）英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
–Look at the dark clouds in the sky up!
--Hurry up! Dark clouds are often _______ of the heavy rain.
A. symbol B. sign C. signal D. message
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