单项选择题

We（）on this project for four hours. Let's have a rest.

A. are working
B. have been working
C. worked
D. had worked

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单项选择题
Galileo lived in the City of Pisa, ______ there is a leaning tower about 180 feet ______.
A. in which; height


B. where; in height
C. which ; high


D. where ; height
单项选择题
She didn't see me come and went on ______ her newspaper.
A．to read



B．reading
C．with reading


D．read
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