单项选择题

The pen ______ on the floor for ten minutes, but no one has picked it up.

A．is lying
B．has lain
C．has been lying
D．lay
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单项选择题
By the time you get to Shanghai tomorrow, I ______ for Kun ming.
A．am leaving
B．will leave
C．shall have left
D．had left
单项选择题
—What do you think of the novel—Oh, excellent. It's worth ______ a second time.
A．to read
B．to be read
C．reading
D．being read
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