(Viên chức Mầm non) 5000+ câu trắc nghiệm Ngoại ngữ có đáp án - Test 2
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While the teacher was explaining the sum on the blackboard, the children threw paper aeroplanes around the classroom.

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C. Identify the one underlined word or phrase - A, B, C or D that must be changed for the sentence to be correct.

While the teacher was explaining the sum on the blackboard, the children

                        A                 B

threw paper aeroplanes around the classroom.

   C                                  D

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Giải thích

Đáp án đúng là C (were throwing)