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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A.so
B.then
C.and
D.because
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Starlite Roofing Installation will accept responsibility for any damages （） it can be proven that defective products were the cause of the accident.

A.unless
B.because of
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