manhasnoname wrote:
Don't understand why D is incorrect. What does "century of" has to do with the verb tense??
Could someone please clarify? Thanks!
X is necessary to do Y: implies that the necessity is in the present.
X has been necessary to do Y: implies that the necessity has been there for some time.
"A century of" implies that the necessity has been there for a century - therefore "has been" is better than "is".
Option D implies that the necessity is from now to
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