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
The journalist refused to ______the source of her information.
[A] reveal
[B] disclose
[C] divulge
[D] betray
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
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