单项选择题

When I arrived, I learned Mary ______ for almost an hour.

A．had gone
B．had set off
C．had left
D．had been away
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单项选择题
______ is believing.
A．Seeing
B．Seen
C．To be seeing
D．To see
单项选择题
The boy wanted to ride his bicycle in the street, but his mother told him ______.
A．not to
B．not to do
C．not do it
D．do not to
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