A. People in China used the abacus (算盘) centuries ago.
B. The abacus was ______ in China several hundred years ago.
科目:初中英语 来源: 题型:033
The professor handed the cup around the class.(改为被动语态)
The cup ______ handed around to the class by the professor.
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科目:初中英语 来源: 题型:033
He doesn't know what he should do next.
He doesn't know what ______ do next.
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