Jack’s hands were (tremble)______all the time as he opened the letter.

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问题 Jack’s hands were (tremble)______all the time as he opened the letter.

选项

答案trembling

解析表示过去某个时间正在持续的动作。该题是指在拆信封的同时手的状态，所以应该用过去进行时。

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大学英语三级B级

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