单选题_____AbestBleastClengthDlarge

单选题
_____
A

best

B

least

C

length

D

large


参考解析

解析:
根据上下文可知,句意应该是“我记录下了涉及至少21所大学的大约300名学生的非正式谈话”。at least至少;at best充其量;at length最后,终于;at large大体上。

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