单选题 This book should be returned to the library______the end of this month.
[A] by [B] from [C] in

【正确答案】 A
【答案解析】考查介同用法。by后跟时间点，指“到…时”；from后跟时间点，指“从…时起”；in后跟时间段，指“…之后”。