单项选择题

Standing on the pavement while waiting for you, we watched bus ______ after bus by.

A．went
B．to go
C．gone
D．go
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单项选择题
I can't speak English, ______ write it.
A．and I can't
B．or can I
C．nor can I
D．or can't I
单项选择题
Mr. Black ______ in summer in the lake near his house. But now it is heavily polluted.
A．used to swim
B．used to swimming
C．were used to swim
D．was used to swimming
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