【題目】 I was doing my homework ________ /wen/my father came home.

A. what B. who C. that D. when

【答案】D

【解析】

試題分析：句意：當我父親回家的時候我正在做作業(yè)。根據(jù)所給音標并結(jié)合句意應(yīng)該填when。故選D。

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