Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best joins each of the following pairs of sentences in each of the following questions.
I had to do my homework. I could not help my mother with the washing-up.
A.Because I was busy doing my homework, I could not help my mother with the washing-up.
B.It was impossible for me to do my homework although my mother helped me with the washing-up.
C.I could not help my mother with the washing-up until I finished my homework.
D.I could not do my homework because I had to help my mother with the washing-up.

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