Trắc nghiệm Chuyên đề 6: grammar (find the mistakes) có đáp án
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When she lookedout of the window, she saw some boys and girls play in the yard. A B C D

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When she lookedout of the window, she saw some boys and girls play in the yard.

                           A         B                                C                                      D

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Chọn đáp án D (playing)