You will not be allowed to change the date of your accommodation due to low room availability, so think carefully ______you make

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问题 You will not be allowed to change the date of your accommodation due to low room availability, so think carefully ______you make a reservation.

选项 A、prior to
B、before
C、afterward
D、otherwise

答案B

解析 语法:连词1.空格后接句子,因此介词(A)选项排除。2.(C)、(D)选项是副词,不能接句子,因此排除。3.before有介词的作用,也有连词的作用,因此(B)为正确选项。
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