单项选择题

David ______ his company's success to the unity of all the staff and their other guests.

A．attributed
B．contributed
C．acknowledged
D．pledged
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单项选择题
As with a human baby, you must be patient, ______ and understanding of your pets mistakes.
A．tolerant
B．strict
C．obedient
D．durable
单项选择题
The Austrian manufacturing industry consists of a few large organizations, many of which operate under government auspices.
A．supervision
B．orientation
C．regulation
D．sponsorship
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