题目内容
I feel my throat________ at the sadness in his voice. I try hard to keep back my tears.
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I ______myself and bring back the garbage bags from the car and the curb.
______she starts feeding coins into laundry machines, she'll appreciate the years of clean clothes I've provided for free.
五声调式从宫音开始，按顺序由低到高排列起来，依次称为宫、商、角、徴、羽。
五声调式是按照纯五度排列的五个音组成，若从C音开始向上连续纯五度相生四次，连同C音就可得到“C、G、D、A、E”五个音。
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