答案及解析：[单选题]They have been trying to develop a car that is powered by electricity, ( ), they haven't succee - 语言文学类题库- 答案窝(daanwo.com)-大学生作业答案及考资分享平台

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[单选题]They have been trying to develop a car that is powered by electricity, ( ), they haven't succeeded yet.
Abut
Btherefore

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