US President Obama's 45-minute tour on the Great Wall ____ his see a very different China fron the one he witnessed two decades ago.A. may not have helped B. must have helped C. should have helped D. could have helpedI feel all above are correct. What do you think?
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" Grammar wise, they are all correct.
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If 'All of the above' is not an option then A is the correct answer because a sightseeing tour of a historical place may not suggest the visible changes such as the city's present-day development unless factors in its vicinity indicate otherwise. One needs to tour the cities to come to any conclusions. That's just my two cents!