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 |
推荐试卷
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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