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

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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
单项选择题
The research and development section is currently experimenting with two new （） which should reduce production time without affecting quality.

A.proceeds
B.processing
C.processes
D.proceedings
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