He walked down the hills, and ________ softly to himself.A．singB．singingC．singsD_刷题宝

题干

He walked down the hills, and ________ softly to himself.

A．sing

B．singing

C．sings

D．was singing

上一题下一题 0.64难度单项选择更新时间:2013-12-23 08:57:52

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