题目
This kind of robot _____help people do dangerous work.
A.
used to
B.
was used to
C.
used for
D.
was used for
知识点：Unit 4 Amazing Science章节：未标注
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This kind of robot _____help people do dangerous work.
答案与解析
自由组卷
围绕这道题再组一份练习 →
完整试卷
浏览同年级试卷结构 →