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
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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
单项选择题
Carl is starting college in September. ______ , he is traveling around Europe.
A．Meanwhile
B．Although
C．As a result
D．After all
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