>is there any possibility that D is also the right choice? NO D would need to be changed to something like: It has been debated THAT what makes Hong Kong so exhilarating IS ITS BUSINESS DISTRICT.
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In these kinds of tests, you have to try to read the examiner's mind.
Unfortunately
Clivewith the student to choose the most appropriate answer.Oh! OK! I see what you were thinking now. Never mind.