Choose the correct sentence which is built from the words and phrases given:
My sister/ willing/ help/ our mother/ housework/ when/ holiday.
A. My sister was willing to help our mother for the housework when she had a holiday.
B. My sister was willing to help our mother with the housework w hen she had a holiday.
C. My sister was willing to help our mother at the housework when she had a holiday.
D. My sister was willing to help our mother on the housework when she had a holiday.

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