An explorer to the island would surely want to visit the Blue Grotto, an underwater cave bathed in blue due to*^*the .
Question 1:
An explorer to the island would surely want to visit the Blue Grotto, an underwater cave bathed in blue due to*^*the ....... position of sunlight reflected through a small hole at the waterline.
A.immense
B.ghostly
C.unique
D.primary
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