单项选择题

Over the past three decades the Chinese people have ______ wonders, which contributes to the economic reforms.

A. worked
B. created
C. invented
D. discovered
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单项选择题
I practiced the speech well, so I didn’t feel ______ when I was speaking.
A. relaxed
B. disappointed
C. nervous
D. tired
单项选择题
—Who is he Is he our new teacher —I’m sorry. I don’t know ______ and ______ he is.
A. who; what
B. who; how
C. how; what
D. where; how
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