AIDS researchers have e（）(run into) a variety of unexpected problems in their efforts to develop an effective vaccine. （请根据给出的首写字母，填入完整单词的适当形式，其意义与括号中的单词或短语相同）
AIDS researchers have e（）(run into) a variety of unexpected problems in their efforts to develop an effective vaccine. （请根据给出的首写字母，填入完整单词的适当形式，其意义与括号中的单词或短语相同）
正确答案：encountered
Tag：研究生英语科技论文写作 单词 括号
时间：2022-01-04 15:56:55
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