[单选题]( )11:30 yesterday they had already had lunch.

A

On

B

At

C

By

D

With

正确答案:C
题目解析

by+时间名词,意为:“到…时(已发生某事),最晚、不迟于…,在…之前”,此时谓语多用完成时。

句意:到昨天11:30,他们已经吃过午饭了。

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