单项选择题

I can’t find the key to my office.I（） have lost it on my way home.

A．would
B．should
C．must
D．ought to
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单项选择题
（）Writing a letter to the manager,he decided to talk to him in person.
A．Instead of
B．Because of
C．As for
D．due to
单项选择题
He could not start the engine,no matter（） hard he had tried.
A．when
B．where
C．what
D．how
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