单项选择题

We should recognize that every company and every person is part of a long ______ of customers and suppliers.

A．pool
B．line
C．stream
D．chain
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单项选择题
European football is played in 80 countries, ______ it the most popular sport in the world.
A．making
B．makes
C．made
D．to make
单项选择题
The president ______ the delegation at the airport but he was taken ill last night, so the vice-president is going to instead.
A．is to meet
B．was to meet
C．has been to meet
D．was to have met
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