单项选择题

Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold—Vitamin C.

A．have taken
B．have been taking
C．have been taken
D．have being taken
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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
单项选择题
More than a year later he arrived back in America ______.
A．ill, tired and unhappy
B．with ill, tired and unhappy
C．felt ill, tired and unhappy
D．be felt ill, tired and unhappy
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