When I got there, they         the old people clean the house.
A、helped                  
B、are helping         
C、were helping

C

解析試題分析：句意：當(dāng)我到那的時候，他們正在幫老人打掃房間。when引導(dǎo)時間從句用過去時，主句用過去進行時，結(jié)合句意，故選C
考點：考查時態(tài)的用法

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