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
His wife divorced him because he was addicted ______.
A．to gamble
B．gambling
C．to gambling
D．with gambling
单项选择题
______ for my illness, I would have lent him a helping hand.
A．Not being
B．Had it not been
C．Without being
D．Not having been
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