In the ETS Arctic example 'the land grades into the landfast ice so ____ that you can walk off the coast and not know you are over the hidden sea', which choice best fills the blank?
Aprecariously
Brelentlessly
Cirregularly
Dimperceptibly
Answer & Solution
Correct answer: D. imperceptibly
ETS's explanation: the word has to characterise the change in a way that explains how a walker fails to notice leaving the land. 'Imperceptibly' does exactly that, an imperceptible grading is by definition one a person cannot detect. 'Precariously', 'relentlessly', and 'irregularly' describe other qualities of the change but none of them entails being unnoticed.
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