something must be done to ______ the bird flu.Something must be done to ______ the bird flu.A) turn off B) take off C) put off D) keep off

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something must be done to ______ the bird flu.
Something must be done to ______ the bird flu.
A) turn off B) take off C) put off D) keep off

选d
keep off 避开;防止;挡住
防止禽流感

D

b

D
我们必须做一些事情来阻止禽流感.
keep off:阻止 阻挡