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
7In the 18th century writers___hours in coffee houses,discus
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