重点词汇与固定搭配 — 英语选择题
题目
实验小组原本没有打算用这种方法测试胶水：胶水洒到纸上后，他们才发现它能粘住纸。The discovery was made ___, and the school science fair ___ last Friday. 选择恰当的短语完成句子。A. by accident; took place B. on purpose; took place C. by accident; took off D. in accident; took place