单项选择题

Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ______of the quality of their products.

A．expense
B．expansion
C．exposure
D．expectation
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单项选择题
On behalf of my company, I am ______to you and your colleagues for your generous help.
A．subjected
B．obliged
C．inclined
D．available
单项选择题
Nothing Helen says is ever______. She always thinks carefully before she speaks.
A．simultaneous
B．spontaneous
C．homogenous
D．rigorous
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