He walked down the hills, and softly to himself.A. singB. singingC. singsD. was singing
He walked down the hills, and softly to himself.A. singB. singingC. singsD. was singing
发布时间：2020-08-17 07:20:44
He walked down the hills, and softly to himself. A. sing B. singing C. sings D. was singing
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A. sing B. singing C. sings (答案→)D. was singing 解析： 本句中的and是一个并列连词，前后都应该是谓语部分，AC两项的时态不对。B项不能单独做谓语。句义：他走下小山，同时在对自己唱歌。更加句义可知走下山和唱歌是同时发生的事情，故使用过去进行时。故D正确。