单项选择题

Anna was reading a piece of science fiction, completely （） to the outside world.

A. losing
B. lost
C. to be lost
D. having been lost

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单项选择题
My train arrives there at eight. The plane I would like to take () by then.

A. will have left
B. has left
C. had left
D. would leave
单项选择题
—Can I pay the bill by check —Sorry, sir. But it is our rule that payment（）be made in cash.

A. can
B. need
C. shall
D. will
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