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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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
单项选择题
Of course, we know that all work and no play makes Jack a dull boy , （） we have decided to add a health club and spa to our staff facilities.

A.so
B.then
C.and
D.because
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