单项选择题

Cross-cultural differences are difficult to research even though anyone who works in different cultures will ________you they exist.

A．pledge
B．secure
C．insure
D．assure
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单项选择题
His services have been ________by his employers; they have not properly rewarded him.
A．canceled
B．withdrawn
C．overlooked
D．deleted
单项选择题
His ________change very quickly; one moment he's cheerful, and the next he's complaining about everything.
A．minds
B．moods
C．motives
D．motions
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