单项选择题

Ever since he______ his job, Allen has been much happier than before.

A．changed
B．had changed
C．has changed
D．changes
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单项选择题
-- I called his office, his home, and all other places he______ possibly go to. But he was nowhere to be found.-- He may not be in town.
A．might
B．must
C．will
D．should
单项选择题
Helen always comes home at weekends,______ the country to the town.
A．preferring
B．to prefer
C．prefer
D．having preferred
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