题目内容：
( ) who caused you to serve dinner an hour later than usual?A.Was he
B.Did he
C.Has he
D.Was it he
参考答案：
选择题：( ) who caused you to serve dinner an hour later t
- 题目分类：当代英语语法概论
- 题目类型：选择题
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A.Was he
B.Did he
C.Has he
D.Was it he
A.Was he
B.Did he
C.Has he
D.Was it he
3[填空题,0.7分] Put the following words in appropriate
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D/A转换器DAC0832的模拟量输出信号是( )(本题2.0分) A、 电流 B、 电压 C、 既
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