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精英家教網 > 高中英語 > 題目詳情
David _____ a customer when the fire started．
A．servedB．was serving C．had servedD．would serve
B

試題分析：句意：當大火開始時正在服務一個客戶。從從句的謂語動詞可知與過去有關，四個選項均為過去時態(tài)。這里表示一個動作發(fā)生的時候，另一個動作正在進行。故用過去進行時。
點評：時態(tài)題的考查要注意關鍵詞，本題的關鍵詞是when引導的時間狀語從句！說明一個動作發(fā)生的時候，另一個動作正在進行。時態(tài)的考查要注意兩方面：一是時間狀語，二是上下文的語境。
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