单项选择题

It is implied but not stated that ancient navigation used to sail ______ .

A．with their knowledge of the winds
B．by the sky
C．by the compass
D．by the currents of the Pacific
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单项选择题
Tom is one of the boys who ______ on time.
A．are
B．is
C．have
D．has
单项选择题
A lot of people have tried，but（）have succeeded.

A．many
B．much
C．a few
D．few
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