单项选择题

It is not uncommon for there ______ problems of communication between the old and the young.

A．being
B．would be
C．be
D．to be
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单项选择题
Overpopulation poses a terrible threat to the human race. Yet it is probably ______ a threat to the human race than environmental destruction.
A．no more
B．not more
C．even more
D．much more
单项选择题
Linda was______the experiment a month ago but she changed her mind at the last minute.
A．to start
B．to have started
C．to be starting
D．to have been starting
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