Cars will ( ) groups of ten to twelve vehicles, only six feet apart, traveling in unison, and controlled by computer. ( 章节：2 难度：2)
- A、bunched into
- B、be bunched into
- C、bunched on
- D、be bunched on
正确答案:A
答案解析:有
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Cars will ( ) groups of ten to twelve vehicles, only six feet apart, traveling in unison, and controlled by computer. ( 章节：2 难度：2)
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