单项选择题

The management encourages all staff to place any complaints, suggestions, or questions in the box （） in the lunch room.

A.provided
B.provision
C.providing
D.provide

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单项选择题

We recently received a memo （） the Accounting Department requesting that all purchases over $1,000 be approved by the heads of sections.

A.before
B.for
C.with
D.from

单项选择题

Unfortunately, several patients at the hospital have been struck by a disease for （） there is no known cure.

A.while
B.whose
C.which
D.that

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