单项选择题

When I went in, he was lying on the floor ______ at the ceiling.

A．to stare
B．stared
C．was staring
D．staring
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单项选择题
No one had told Smith about ______ a lecture the following day.
A．there be
B．there being
C．there would be
D．there was
单项选择题
In 1901, H.G. Wells, an English writer, wrote a book ______ a trip to the moon.
A．describe
B．described
C．describing
D．to describe
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