She worked deep into the night _____ a l_爱下问搜题

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问题选择题

She worked deep into the night _____ a long speech for the president. [ ]

A. to prepare

B. preparing

C. prepared

D. being prepared

答案

答案：A

选择题

Did you learn English _ your English book? [ ]

A. /

B. at

C. from

判断题

节点机动时间等于0的节点均出现在关键线路上。