Question

In the sentence, certain words are in bold and numbered from A to E, which are the possible pairs to be interchanged. Choose the pair(s) of words which need to be interchanged to make the sentence grammatically correct and meaningful. Despite this  (

  • A unidentified  and the efforts of thousands of scientists working to  (
  • B ward  off dangerous new  (
  • C outbreaks , the coronavirus behind COVID-19 was  (
  • D network  when it launched into an  (
  • E unprepared  world at the end of 2019. 
A B-C
B D-E
C A-D
D A-C
E None of these
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