单项选择题

—Why Where is the key to the sound lab
—Dear me! You （） it in the taxi!

A．have never left
B．never left
C．haven’t left
D．didn’t leave

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单项选择题
I would have gone to the meeting if I （） time.

A. had had
B. have had
C. had
D. would have had
单项选择题
（） in 1636, Harvard is one of the most famous universities in the United States.

A. Being rounded
B. it was founded
C. Founded
D. Founding
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