单项选择题

She went to the bookstore and bought ______.

A．dozen books
B．dozens books
C．dozen of books
D．dozens of books
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单项选择题
As you can see, the number of electronic eyes on our roads ______ rising these days.
A．was keeping
B．keep
C．keeps
D．were keeping
单项选择题
Many things ______ impossible in the past are quite common nowadays.
A．having considered
B．considered
C．to be considered
D．considering
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