the use of worth

English as a Second Language English Vocabulary, Grammar and Idioms
1

1.The mansion he lives in should ___ two million dollars.
(A)be worth (B)worth
Ans: (B)

I’ve looked up the dictionary, and the definition and the example are as follows
having a particular value, especially in money
Our house is worth ￡200 000.

So, why can’t I choose (A)???

2

A is correct, not B.

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