37. _____ could prevent covid-19 second waves as a study says.(A) Widespread mask-wearing (B)Widespr

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37. _____ could prevent covid-19 second waves as a study says.
(A) Widespread mask-wearing
(B)Widespreading mask-wearing
(C) Widespread wearing-mask
(D) Wearing-mask widespread

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上一篇 : 36. Foxes in cities are evolving to have smaller faces and skulls— similar to the way dogs and cats
下一篇 : 38. Mumbai, _____, has emerged as the country’s coronavirus hot spot, with more than 40,000 cases an

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