The robot needs _______nce a month. And we will check it for you for free. A. to check B. be checked...
2022-12-04 21:44:54 27次 2016届江苏射阳县长荡初级中学九年级下期第一次月考英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The robot needs _______nce a month. And we will check it for you for free.
A. to check B. be checked C. checking D. check
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