選擇適當(dāng)?shù)脑~語替換句中的畫線部分

By the time Dick got to class, his math teacher had already started teaching.

[　　]

A．Before
B．As soon as
C．While
D．When

答案：D
解析：

點撥：此句的主句為過去完成時，by the time意為“當(dāng)……的時候”，可用when替代。


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