单项选择题

Although she was still ill, she ______ herself from the hospital.

A．extracted
B．discharged
C．injected
D．drained
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单项选择题
She has become quite ______ to the company.
A．influential
B．compulsory
C．indispensable
D．essential
单项选择题
To survive in the intense trade competition between countries, we must ______ the qualifies and varieties of products we make to the world market demand.
A．improve
B．enhance
C．guarantee
D．gear
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