often: frequently. They wouldn’t use a comma before “of which”, because they don’t want to make it readable. We could use a comma if we want our words more readable.
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Mamger
Often the need to clean up the atmosphere ---- through major environmental disasters of which the London smog of 1952 still ---- a prime example.
A) was realised / remains
B) has been realised / remained
C) would be realised / would remain
D) was being realised / will remain
E) had been realised / has remained
Nona The BritThe final clause would only suggest that the smog remains today (as opposed to being an example that remains today) if it said still remains as a prime example.
A is the only workable option for me as 'remains' is the only one that naturally follows 'still'. Then looking back at the start 'was realised' makes sense here.