To observe the wild animals, the scientists hid behind the tree and ________ silent. A. keep B. keep...
2022-09-29 16:57:22 60次 上海市普陀区2019届九年级上学期期末（一模）质量监控英语试卷（ ） 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
To observe the wild animals, the scientists hid behind the tree and ________ silent.
A. keep B. keeps C. kept D. was keeping
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