I()in this room watching television when someone()on the door.

科目名称：人文英语3

试卷号：11379

题型：词汇与结构(单选题)

题目：I()in this room watching television when someone()on the door.

选项：A. sat...knocked B. sat ...was knocking C. was sitting ...knocked

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答案：C. was sitting ...knocked