2011.64.In recent years, there have been over 30 foreign companies _______ business in this city.
A. doing
B. do
C. to do
D. done
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2014.128.The company makes it possible _______ the market information with its partners.
A. share
B. sharing
C. to share
D. shared
2013.610.Computer technology makes it ______ for people to work from home.
A. harmful
B. serious
C. possible
D. difficult
2014.68. You can trust our product as we have _____ control over its quality.
A. strict
B. limited
C. little
D. natural
2011.126.Some companies might not let you rent a car __________ you have a credit card.
A. where
B. because
C. since
D. unless