somebody sees something when he/she ( ) to work.A.walk B.walked C.walking D.is walking说明理由

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somebody sees something when he/she ( ) to work.A.walk    B.walked    C.walking    D.is   walking说明理由

somebody sees something when he/she ( ) to work.A.walk B.walked C.walking D.is walking说明理由
somebody sees something when he/she ( ) to work.
A.walk B.walked C.walking D.is walking
说明理由

somebody sees something when he/she ( ) to work.A.walk B.walked C.walking D.is walking说明理由
选D.when 引导的时间状语从句,主句用一般过去时,从句 用过去进行时.

选 D.is walking
when he/she is walking to work=when walking to work。
时间状语,正在去工作的路上看到了某事,用ing