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Bunuel
Some adults lack the enzyme that splits lactose into simple sugars and thus find it difficult to digest milk products.

A. into simple sugars and thus find it difficult to digest milk products
B. down to simple sugars and thus find it difficult to digest milk products
C. down to simple sugars and thus find difficulties in digesting milk products
D. into simple sugars and thus finds it difficult for digesting milk products
E. among simple sugars and thus finding it difficult to digest milk products




OFFICIAL EXPLANATION



Answer: A.

There are two idioms here: “splits…into” and “difficult to…” Choice A uses them both correctly. In this context, “split…down” is unidiomatic, as is “difficult…for.”
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