单项选择题

The country has already sent up three unmanned spacecraft, the most recent ______ at the end of last March.

A．has been launched
B．having been launched
C．being launched
D．to be launched
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单项选择题
All the afternoon he worked in his room with the door ______.
A．to lock
B．locking
C．locked
D．lock
单项选择题
When I caught him ______, I stopped buying things there and started dealing with another shop.
A．cheating
B．cheat
C．to cheat
D．to be cheating
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