单项选择题

For a long while he waited, not daring to descend from his hiding place ______ they should come out and catch him in the act.

A．when
B．lest
C．that
D．where
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单项选择题
Dr. Jones checked the patient's ______ carefully before making his treatment.
A．symbols
B．symptoms
C．signs
D．conditions
单项选择题
When I finished the story, Lenin jumped up from his chair and started pacing the floor, ______, deep in thought.
A．with his head bending
B．in his head bent
C．his head bending
D．his head bent
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