单项选择题

—The door was open.
—It （）open. I had locked it myself and the key was in my pocket.

A. can’t be
B. mustn’t be
C. can’t have been
D. mustn’t have been

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Prime Minister, accompanied by his minister of foreign affairs,（）for America tomorrow morning.

A. are to leave
B. are leaving
C. leave
D. is leaving
单项选择题
（） is known to the world, Mark Twain is a great American writer.

A. As
B. It
C. That
D. Which
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