517. Looking around the students, I found some students were giggling, ____ others were quite attentive.
(A) because
(B) once
(C) if
(D) while

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統計： A(10), B(7), C(4), D(63), E(0) #1592727

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#2348672
giggle 傻笑attentive專心
(共 22 字，隱藏中）
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