A wolf in sheep's clothing?

[hungnt]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #45 "Clothing Idioms Test (1)", question 5

I think her new boyfriend is a sheep in wolf's clothing.

(a) a person who wears animal skins
(b) pretending to be nice but is really dangerous
(c) pretending to be dangerous

English Idioms and Expressions, Advanced Level

ESL/EFL Test #45 "Clothing Idioms Test (1)", answer 5

I think her new boyfriend is pretending to be nice but is really dangerous.

Correct answer: (b) pretending to be nice but is really dangerous
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please rewrite it as a wolf in sheep's clothing

hungnt

[Yankee]

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Thanks for pointing that out, hungnt.
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Amy
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ESL teacher, translator, and a native speaker of American English