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In each of these questions, a sentence has been divided into four parts and marked a. b, c and d. One of these parts contains a mistake in grammar Idiom or syntax. Identify that part and mark it as the answer.

A. We were shown two houses yesterday

B. by the broker who is helping us in this regard

C. but we found that none of them was suitable

D. for our specific requirements

Please do not use chat terms. Example: avoid using "grt" instead of "great".