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

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

A．Since
B．From
C．By
D．At
单项选择题
In the（）half of the 17th century those cities became even more prosperous.

A．latter
B．latest
C．later
D．late
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