单项选择题

He found it necessary for us ______ from each other.

A．to help and learn
B．helping and learning
C．to learn and help
D．learning and helping
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单项选择题
60% of the population of the town ______ workers; things are different now.
A．is
B．are
C．was
D．were
单项选择题
I don't know whether you happen ______ , but I'm going to study in the U.S.A. this September.
A．to be heard
B．to be hearing
C．to hear
D．to have heard
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