单项选择题

David ______ his company's success to the unity of all the staff and their persevering hard work.

A．attributed
B．contributed
C．acknowledged
D．pledged
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单项选择题
The new law allows you to ______ payment if you think a bill is incorrect.
A．withhold
B．withdraw
C．wither
D．withstand
单项选择题
As with a human baby, you must be patient ______ , and understanding of your pet' s mistakes.
A．tolerant
B．strict
C．obedient
D．durable
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