单项选择题

After several days' investigation, the police found out one clue that voices were heard ______for help from some very distant place that night.

A．to call
B．called
C．calling
D．call
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单项选择题
His long-time drug taking has _____his health so much that he couldn't even take care of himself now.
A．injured
B．hurt
C．impaired
D．wounded
单项选择题
They are talking vigorously about the people and countries ______they had visited.
A．which
B．that
C．what
D．where
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