She is singing and dancing merrily when the doctor called to see her

Câu hỏi :

Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions.

A. Is

B. Merrily

C. The doctor

D. To see

* Đáp án

* Hướng dẫn giải

Đáp án

A

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