He walked down the hills, and ________ softly to himself.
A．singB．singingC．singsD．was singing
D

試題分析： 本句中的and是一個并列連詞，前后都應該是謂語部分，AC兩項的時態(tài)不對。B項不能單獨做謂語。句義：他走下小山，同時在對自己唱歌。更加句義可知走下山和唱歌是同時發(fā)生的事情，故使用過去進行時。故D正確。
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