The professor suggested the problem ________ at once. A. referred to be solved B. referred to solvin...
2022-09-21 17:27:49 40次 黑龙江省牡丹江市2019届高三上学期开学摸底考试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The professor suggested the problem ________ at once.
A. referred to be solved B. referred to solving
C. referred to was solved D. referred to must be solved
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