在ph5.0的缓冲溶液:7In the 18th century writers___hours in coffee houses,discussing the news of the day.
来源:百度文库 编辑:中科新闻网 时间:2024/10/05 10:47:53
解释一下原因
Aused to spending Bused to spend.Cwere used to spend.
Aused to spending Bused to spend.Cwere used to spend.
used to + do:"过去常常"表示过去习惯性的动作或状态,但如今已不存在。
be used to + doing: 对……已感到习惯,或"习惯于",to是介词,后需加名词或动名词。
be used to 是被用于..
所以是B
B
经常干某事,固定格式
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7In the 18th century writers___hours in coffee houses,discussing the news of the day.
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