单项选择题

If the letter (to be mailed) (was placed) on the writing table an hour ago, it (is) certain (being) there now.

A．to be mailed
B．was placed
C．is
D．being
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单项选择题
Doctors see a connection between increased amounts of leisure time spent ___________and the increased number of cases of skin cancer.
A．to sunbathe
B．to have sunbathed
C．having sunbathed
D．sunbathing
单项选择题
The system was redesigned to embrace the network and eventually ___________ it in a profitable direction.
A．adapt
B．control
C．install
D．steer
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