(单选题)

______ time went by, Herbert could finish all the math exercises in class.

A.With

B.As

C.While

D.Since

参考答案：B

参考解析：

本题考查时间状语从句。“time went by” 与后半句为完整的两个句子，因此空格处需填连词，with 为介词，结构为 “with time going by”，据此排除A项；as “随着”，连词，该处表示“随着时间流逝”，as time went by 作时间状语从句，符合题意；since “因为；自从”，while “虽然；然而；当……时候”，均不符合语境。故本题选B。

知识点：

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