It was a confusing situation. Many things were happening ......... the same time. A. at B. on C. in D. of

<div class="question"><br /><div class="result"><br /><p style="color: #44a500;font-weight: 700; font-size: 22px; padding-bottom: 5px">Chọn A</p><p style="color: #e29000; font-weight: 700; font-size: 22px; ">Giải thích:</p><br /><div>at the same time: cùng một lúc</div><br /></div><br /></div>