—Tom, have you finished your homework?
—Yes, I ________ before you came back, mom.
A．finishedB．have finishedC．had finishedD．finish
C

試題分析：考查時態(tài)：句意：--湯姆，你完成作業(yè)了嗎？--是，你回來前我就完成了，媽媽。說明完成作業(yè)是在媽媽回來前，是過去的過去，用過去完成時，選C。
點評：時態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時間狀語。要根據(jù)時間狀語來選擇合適的時態(tài)，在平時的學(xué)習(xí)中要注意積累有關(guān)時態(tài)的用法和各種時態(tài)的特殊之處。過去完成時是相對的時態(tài)，是過去的動作之前發(fā)生的。
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