单项选择题

______ coming here, I haven' t seen a single person.

A．Since
B．From
C．By
D．At
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单项选择题
I didn' t understand at first why he couldn' t pass the test, no matter ______ hard he had tried.
A．when
B．where
C．what
D．how
单项选择题
______ the news, Ida changed her plans.
A．In hearing
B．To hear
C．Of heating
D．On hearing
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