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it was 空格he fell ill suddenly that he didn't come to the meeting this morning.
a:because b:since c;as; 为什么?
人气:420 ℃ 时间:2019-08-21 20:32:50
解答
用because,强调原因中的特定用法,since与as表原因一半只用于句首或单独成短句.
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