It was the A/N1H1 epidemic ____ spread almost throughout the country ____ promoted the research and production of the flu vaccine.
| A．that…that | B．that…which | C．what…that | D．that…what |
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It was the A/N1H1 epidemic ____ spread almost throughout the country ____ promoted the research and production of the flu vaccine.
| A．that…that | B．that…which | C．what…that | D．that…what |
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